I am considering that, but shutting down during off hours so as not to run into a bill of >$200 a year (I'm not a new customer).
I am curious about people's experiences with using them for that purpose.
I found using EC2's non-micro instances somehow inconvenient because boot times seemed to be too long for casual use, plus I had to pay extra for a permanent IP. Maybe I'm too lazy, or perhaps the micro instances are more suitable for that purpose?