I have upgraded my website/blog/podcast/photoblog/linkblog/whatever to Drupal 5.0-rc1 today (I'll skip 5.0-rc2 for now and wait for the final release of 5.0 for the next upgrade).
The upgrade went quite nice, even though I had to upgrade several modules and port quite a bunch of custom hacks I had on my old (Drupal 4.6) site. I first upgraded to 4.7, then to 5.0 (as is the recommended procedure) on a test-site, and after figuring out how to fix or work-around all the issues that appeared, I upgraded the live site.
I password-protected the site during the upgrade, that's why it wasn't available for a while today (and caused some problems on Planet Debian it seems, sorry for that!).
New features you might enjoy:
If you notice any bugs or problems with the site, please let me know.