I have a WordPress blog at englishadvantage.info which I just updated to 3.0. I also installed WordPress at englishadvantage.info/testblog so I could set up a test blog to play with twenty ten.
I imported my pages and posts from the first blog. Everything appears to work fine, no error messages. However no posts or pages are imported.
Tried reexporting and reimporting. Did nothing. Made sure that the permalink/archive settings were the same for both blogs as well as the date and time formats. Still doesn't work. Couldn't find any recent forum posts on this topic.
I must be missing something really obvious.