What PL does /prog/ use at work?

Do you like it or hate it? Have you tried to convince your bosses to let you use some other programming language? If so, what language? Did it work?

For the past two summers I've been using ASP.NET & C#, T-SQL, and a tad bit of Javascript (if that counts).

Loved it. The .NET libraries greatly increase productivity and programmer efficiency.
I didn't get far into the "improvements" that MS offers in their SQL dialect, so I can't really comment on it, specifically.

This summer I'll be using Java. Not sure which specific APIs since I haven't gotten much info on my assignment just yet. But I like Java, it compares well against .NET (as far as programmer efficiency).