Here is a list of my favorite WordPress plug-ins and why I like them so much:
Add Meta Tags Automatically
If you’ve been adding meta tags manually now this plug-in pickups up your first few sentences and title and automatically adds them as meta tags to your post. As long as your first sentence is keyword dense and on topic, you’ll find this plug-in a real time saver.
You may need to search on WordPress for this plug-in by Dan Cameron, but it adds the feed sensing code in the top template of your blog.
Google Sitemap Generator
This is another great automatic plug-in that does the work for you keeping Google up-to-date on all of your posts.
Social Bookmark Creator
Automatically add the links you want to the various social bookmarking sites with just a few clicks for configuration.
Database Backup Tool
This makes saving your blog posts easy with either a scheduled and emailed backup or server backup of your blog posts.
These are just a few of the top WordPress plug-ins that we routinely recommend for installation on WordPress blogs. If you swear by others, let me know by leaving a comment with a link to the plug-in that you like.