Each Typepad account level comes with limits on bandwidth and storage, which you can review here.
If you do exceed the bandwidth or storage limits for your account level, your online content will not be affected. We do monitor the bandwidth and store usage for each account, and if your bandwidth exceeds the limit from month to month, we'll contact you with a more personalized solution.
If you're hosting certain files that use a lot of diskspace and bandwidth, you might want to look into the Coral Distributed Network. They allow you to host your file(s) on their distributed network just by appending
.nyud.net:8090 to the URL.