I upgraded from Wordpress 1.5.2 to Wordpress 2.0.2 this morning.
The servers that power unto.net have a relatively small amount of memory available. I had found that even a single request to WP would instantly balloon the resident memory up to 25MB from the 7MB baseline.
Since Wordpress 2.0 has caching built in I hoped that would address the concern. So far, so good. Per process memory is down, at least for static WP views. The first view of a static page now pushes the process’ memory up to 13MB, 7MB of which are shared. Editing a post (i.e., hitting wp-admin) seems to push that to somewhere around 20MB. (By the way, this is absurd, so I’m not sure what’s really going on.)
The AJAX-style WYSIWYG post editor is acting a little wonky for me — paragraph breaks in particular are hard to deal with — and I haven’t bothered upgrading all of my plugins. Otherwise there doesn’t seem to be a downside to the upgrade. Akismet still works, which is key.
For what it is worth, I didn’t upgrade “in-place” the way the Wordpress documentation suggested. I set up a parallel directory for the new installation and upgraded there. This instantly broke my old version but then I simply flipped the symlinks around and the users were up and running. The Wordpress developers did a great job making the upgrade process painless, even for someone who had made some tweaks here and there along the way.
On a related note, I did an install of MediaWiki for Unto.net today. I haven’t opened that up to the public yet, but the plan will likely be to replace the Unto.net Wordpress blog with MediaWiki. I would like to allow registered users to feel free to make edits if I leave something out of a post.
Please let me know if there are any issues with the new site.

May 1st, 2006 at 8:27 am
hey d, have you tried posting an embedded video from youtube or google video yet? the wysiwyg editor seems to kill it when i post and i can’t figure out a workaround.
May 1st, 2006 at 8:35 am
I haven’t tried that, but I did find the new editor so broken that I switched out of it. Go to Options->Writing and uncheck “Users should use the visual rich editor by default.” The editor reverts to the old style and is much more functional.
May 1st, 2006 at 9:34 am
you know what, i tried that and it still kept the wysiwyg editor as a default. yep, tried it again with no luck. strange…
May 5th, 2006 at 5:43 am
I think cache is off off by default at 2.0.2 (it was on by default with 2 and 2.0.1)
Have you tried Wp-Cache?