What’s missing from Amazon’s suite of web services? Two things: SimpleDB which provides database-like persistence and SimpleBalancer, which load balances “services” on multiple EC2 clusters. While it’s possible to emulate both using S3 and EC2 right now, it’s hard to do, and feels really clumsy. When Amazon does engineer these things, expect Google to take a peek in as well. Oh, we live in interesting times.

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