Okay, this isn't really a problem for most people, but it's a deal killer for me: Even TypePad Pro only comes with 5 GB per month of bandwidth. That's not bad for the price, really, but it's less than a day's worth for me. Most people, however, won't have issues with that unless they get a lot of referrals from elsewhere. I haven't heard people complain about TypePad's policies, which is probably because at the moment, they don't appear to have any yet: "We will be charging overusage fees for bandwidth and disk overusage. We haven't yet set the rate for those fees, and we will not actually be charging them until we have an option in place to purchase additional bandwidth or disk space at a lower cost."
Seems reasonable, though if you've got a high-traffic blog you may want to look at a standalone Movable Type installation instead, or talk to the TypePad folks about cutting a deal. . . .
UPDATE: Just checked the stats on InstaPundit's server and it's used 216 gigabytes so far this month, making it something over 10 gigabytes a day. So I guess I won't be switching to TypePad. . . .