Just a small note. Recently I've migrated Sashblog from b2evolution to Movable Type. To accomplish this, I wrote an export script for b2evolution database, which prepares data in format Movable Type can understand. The script exports published entries and comments to them.
What's wrong with b2? The primary reason - bad spam protection and publicly available statistics, which opens a hole for reference hunters. Also, MT has a better template system.
UPDATE Nov,20 2011: I've fixed the link to the file, hope it is still useful to someone..
Technorati: Movable Type b2evolution