Originally Posted by viki

I thought you were asking a rhetorical question with the tweaks and plugins as it's so easy to find them. Here are a few I like:

- Google Sitemaps plugin
- Various META tag plugins that optimize each individual page
- Permalinks
- Only linking each post to one category
- Morphing feeds plugin if you're syndicating other RSS feeds. (this isn't free)
- Framebuster to redirect GIS traffic

I'm not linking to exact plugins because I have mostly older versions of WP and don't know if they all work.