From the Blogger status page –
We’ll be taking Blogger down on Wednesday the 25th at 4pm PST to fix a bit of a switch that’s gone wonky on us. The outage should last about 15 minutes. Blogger.com and Blog*Spot blogs will be inaccessible during this time.
This repair will fix the problem that caused the brief outage last Friday night. We’re also using this down time as an opportunity to tune our databases for more efficient spam catching and deletion.
So, don’t be surprised when your favorite BlogSpot blog is out of commission for a while right around the end of Mark Belling’s show. Hopefully it will be just the 15 minutes they predict (any bets on that? :-)