If you’ve logged in to your admin screen lately, you should have see a notice that “WordPress 2.8.5 is available! Please update now.” It’s not a major update. WordPress is calling it a “hardening” release; it’s basically a security update.
I updated plugins at the same time I updated to 2.8.5 on TechnoEarthMama, and All in One SEO Pack was one of those with an update. Some people have gotten 502 errors recently after updating this plugin; I got one when I tried to go to the plugin’s admin screen to update options. I simply deactivated and reactivated the plugin, and everything was fine after that, but if it’s still not working for you, Devin Price tweeted a post on the WordPress.org forums which offers another solution. It does require editing the plugin. Also, don’t forget that there’s a radio button you need to click on the All in One SEO Pack settings page to enable the plugin (in addition to activating the plugin through WordPress).
Finally, if you’re interested, you can find out more about the changes coming in WordPress 2.9 over at ShanKrila (thanks to Kelly Guimont for the tip).
Portland WordPress Meetup 
Kathleen,
Thanks for the tip on the All in One SEO Pack plugin issues. Plus, a huge hi-five for a link to my WP 2.9 post. Glad you liked it!
i am still looking for a good SEO plugin for WordPress. my blog is not ranking high enought for the keywords that i wanted to rank.
I would like to recommend the Platinum SEO Pack, it has more useful options than the all in one seo pack. There are more nofollow selections, additional post, page and home headers, you can nofollow all of the outgoing links on just the front page, you can add the noydir meta tag, the noodp meta tag, you can use the option for noindex on sub pages and my favorite option of all is all of the options that it gives you on each individual post and page of your wordpress blog.
Those are just a few of the things that I can think of off the top of my head. The fact of the matter is that I have used both and have found that I am in greater control of my websites on-page seo than when I was using the All in One SEO Pack.