I've finally gotten around to importing a bunch of old entries (everything before Fall of last year, when I jumped hosting providers.) The process was not entirely seamless. I'd chosen to import all entries with the status 'Draft' thinking that I could then easily work through them at my leisure in small batches: checking for broken links; updating paths to included images; etc, etc. But MT imported them all and published 'em straightaway. And changing the status of all those entries to Draft (even using the 'Power Edit' screen for Entries) is rather tedious. So.. if you go poking around in the older entries of the site for awhile? Caveat Clickor.