Directories and .txt files sound like a no-brainer, but the 10MB limit might actually be very useful, and I hope they don't raise it anytime soon.

Remember when everyone bitched about the fact that Twitter only allows 140 characters? But that little inconvenience helped spawn an entire industry of URL shorteners and very simple image hosting solutions. Not necessarily a desirable development (especially URL shorteners), but we can't deny that the 140-char limit triggered a great deal of innovation.

Think of the 10MB limit as a challenge. Try to cram as much as possible into it, and make liberal use of CDNs and third-party storage services like S3. You'd be amazed at what you can do with 10MB of disk space if you concentrate on text and minified scripts.