Tonight I upgraded the Wordpress install on the site to version 2.8, resulted in about half-an-hour’s downtime while I untangled some merge conflicts the svn update to 2.8 combined with a move to the new Wordpress core svn server created. Interestingly the process went fine on my test server, but not on live; I’ll have to look into that. Anyway, apologies for any inconvenience the downtime may have caused you.
The 2.8 upgrade itself is almost entirely back-end, admin stuff, and shouldn’t have any impact on the visible site at all.