Apps for programmers

I've recently treated myself to an iPad for the first time ever, and I'm loving it so far! I work as a software engineer (developing C#/ASP.NET applications), and I'm just wondering if any fellow programmers out there use their iPad in their job? One key thing I'll likely be doing is having MSDN references open on it so I can explore some .NET classes, but just looking for some ideas off others too.