I have been working on some performance tuning, which is always both a blessing and a curse. It's fun to dissect everything and time the different sections, but it gets real hard when you have to completely re-design routines. Of course, you can always fall back on caching, but that is almost like cheating. :) Anyway, here are some links.

• New Build Engine MsBuild - Sam points to a new MS Build on the way.
• Regex Tools- Mike has put together a good list of .NET regex tools, I have been using Expresso but I might have to check out some of the others.
• XSLT Performance in .NET - Interesting article over on O'Reilly's .NET site.

-James