Be the GoogleWould you like 500mb of web hosting, plus Python, plus Django, plus a lot of Google database and application goodies? Would you like it for free? Then, my friend, what you need is Google App Engine. No mention yet of what the pricing is like after you hit your 5 million hits per month. But trust me, if you're at 5 million hits per month, you don't care.
Sorry Amazon S3, but you can basically suck it.
Update: um, yeah, it's wait-listed. Though if you have Google Apps, you're probably in.