As you may have been seeing over the last few weeks, there are intermittent errors in some parts of mine and Kimberly's blogs. Our hosting site and our blog guy have figured out that there's an ASP version mismatch which is causing the problems – and they're going to fix it this week.
So – apologies for the problems – they've been bugging us too. If you hit an error, refreshing a few times should clear it.
[Edit: 03/08/09 - looks like everything's working now!]