I had this in mind a while ago but I guess someone finally did this.
Today I received an email saying:
Authorize log-in attempt
An attempt to login to your blockchain.info wallet was made from an unknown browser. Please confirm the following details are correct:
Time: 2013-09-25 03:16:43
IP Address: 23.29.121.166 (United States)
User Agent: Python-urllib/2.7
It's a while that I haven't used my blockchain.info wallet in any forms (chrome plugin, mobile app, etc)
As the Python-urllib says, it's a script doing this login from a probably proxy with the specified ip.
something fishy is going on in shirt! secure your accounts