Another important thing I forgot about WP that sucks SEO wise is that you have to check if your theme has the same meta description tag on all pages.
Either write unique ones (which is the best solution) or dont use the description meta tag and let the bots decide the snippet of content they are going to use.
The last solution is not good because (as I learnt the hard way) sometimes the designs might have, for example, your side menu text first.Then all your descriptions in your google serps will have the menu text in them.And a good description on the serps might be what gets the surfer clicking to your blog.
I use this plugin that lets me write the meta description tag, or if I´m lazy it just takes the first sentences of the post for the description:
http://guff.szub.net/2005/09/01/head-meta-description/