Okay, so I'm a fairly new blogger myself and I'm definitely no expert...but here's some of the things that matter to me as a reader of other blogs:

1. GRAMMAR
For the love of kittens, use good grammar!! I hate when I'm reading a review and the grammar is so bad that I can't focus on the opinion being stated. Know the difference between your/you're, there/they're/their, and when to use an apostrophe. It drives me crazy to see more than one dog being called dog's. Small things like this make my eye twitch. (I've been seeing "bare with me" used a lot lately...are we getting naked together????) If you have to, USE SPELL CHECK. Preview your post and proof read it first. In my opinion, exercising outstanding grammar makes your blog more professional.

2. DESIGN
Yes, I'm shallow. I am much more likely to follow a blog that looks pretty than something just haphazardly thrown together. Designing is hard work and it takes time, but it's worth it in the end to make your blog visually appealing. I'm constantly making tweaks to mine, and I am still highly considering paying someone to make it special for me.
HTML is good to know as well. After tons of research on how to use specific codes, I've got a pretty good understanding of it. (I'm good at figuring things out on my own, though) When I don't know how to do something, I do a Google search. This is how I found out how to use <h1> and <h2> tags, post dividers, and <marquee> for my blog roll. Any questions? Ask! If I know it, I'm more than willing to share :)
Also, make your blog easy to navigate. I hate visiting a blog and not being able to find pages or archives. These are fantabulous tools that can make it much easier for readers to find things on your site. If you don't have a review archive, I'm much less likely to come back.
Be mindful of your design. Don't put flashy backgrounds or widgets that slow your load time. If I have to wait ten minutes to see your blog, I'm probably not going to come back. And for crying out loud, don't do automatic sound. That's another scare tactic to lose readers.

3. BE HONEST
Always, always be up front when reviewing. Who cares if you didn't like the book? Everybody has their own opinion. It doesn't make you the spawn of Satan if you hated something everybody else loved. In fact, I'm finding that the books with glowing reviews are usually the books I end up not liking. I'm not saying to bash the author, because they did put a lot of time and care into writing it, but state your honest opinion and back it up with reasons why you felt that way. Rants are my favorite reviews to write (and read)!
And never apologize!

4. COMMENT
I've been pretty bad about this lately, due to sheer laziness. I do read my comments and posts on other blogs, but I don't always leave a comment. Don't follow my example. It's always good to show your readers you care by returning the comment love. I've got to break myself of the lazy habit and start spending more time in this area.
That being said, leave meaningful comments. It drives me crazy when someone comes by and leaves a half-assed one liner and expects me to come visit their blog. I feel like they're just doing this for more traffic. I've also had a few copy and paste the same (irritating) generic message on every blog they come across. Don't be that person. 

5. DO MEMES
But not too many!! Memes are a great way to find new blogs and increase traffic to your site. Just pick the ones you like the most (for me it's In My Mailbox and Follow Friday) and stick to those. You don't have to do one for everyday of the week. Yes, I did this as a new blogger. I have now dropped Waiting on Wednesday (unless the occasion calls for it) and this is the first Top Ten Tuesday I've done in over a month. I just haven't had the time I did when starting, and I'd rather focus on my reviews, which is why I started the blog in the first place.

6. GET RID OF CAPTCHA
I can't stress this enough. Like I said, I'm very lazy. If I have to take the extra time to figure out whether the Captcha says crazy banana or lazy cabana, I'm more likely to skip leaving a comment altogether. If you're worried about spam, make it so anonymous users can't comment.

7. NETWORK
Get a Facebook page and a Twitter account to stay connected. Twitter is my go to place when I want the latest news. Goodreads is my personal favorite because it's like Facebook for book lovers. You can see updates on books your friends are reading, and this is where I find most of the interesting looking books I add to my TBR pile.

8. DON'T DO IT FOR FREE BOOKS
If you started blogging for the pretty ARCs that you see in the blogosphere, you should stop right now. Book blogging is for those passionate about reading. Don't lose sight of that!
As a new blogger, (in my opinion) you shouldn't even be requesting ARCs. If you want advance books, set up a Netgalley account. They're pretty lenient on who they give ebooks to.

9. DON'T GET CAUGHT UP WITH STATS
Don't worry about how many pageviews or followers you have.  Not gonna lie, I did this a lot as a new blogger. It will just stress you out and take the fun out of it.

10. DON'T FEEL OBLIGATED
You don't have to accept every single review request. When I got my first one, I was ecstatic!! And for the first several, I said yes no matter what. And guess what? Now I'm stuck with books I don't want to read. Reading should never, ever be a chore. This isn't high school anymore. Read whatever the heck you want, whenever you want to!
I had this problem with Netgalley, too. I went on a giant requesting spree when I first started and again, I'm stuck with books I don't want to read. Be picky about the review requests you accept. Just be polite when you say no!

Leave me your links loverlies :)