Easiest way to update 100+ wordpress blogs?

I have a bunch of wordpress blogs that I want to update. Specifically, I want to add my aweber e-mail opt-in code to the general post page in the template (can be done through the normal wordpress admin interface).

Does anyone know of an automated way to do this? All of the usernames/passwords for wp-admin on the blogs should be the same. Would something like imacros work for this project? Can you think of anything else that would automate this or at least speed it up? I'd rather not have to do it all manually due to the number of blogs that need updating.

Thanks for the help, I appreciate it!

You could create a script using curl or similar to log in via ftp and upload the appropriate files.

iMacros, UBot, outsourcing are the quickest 3 methods I can think of. You could have a UBot created for less than $100 I would think.