Python. Seriously. I use it for a lot of small stuff. I also like to use the command line module for creating easy little project specific "shells" that I drop in frequently used queries etc. (show all tables in the projects db, search for stored procedures etc. - yeah, doing a lot of t-sql lately...)
I tend to accompany big c#/t-sql projects with a little python script that extends the cmd.Cmd class to give me a small collection of helpful queries etc. that I can use to poke around in the database.
Also, I often use python to modify input data (often csv files, but any junk will do) into insert statements etc. Or do plausibility tests on that data.
