Re-Throwing Exceptions in .NET
I promised myself that I would go to bed, but had to blog about something I bookmarked back in October and never posted it...
Brad & Brenton have a few posts explaining why you should use "throw;" instead of "throw ex;" when you want to "re-throw" an exception in the .NET Framework.
Brad - http://dotnetguy.techieswithcats.com/archives/004118.shtml
Brenton - http://weblogs.asp.net/bhouse/archive/2004/11/30/272297.aspx