This is a great new program from the guys who brought us Spybot S&D. You can get it here. It's very useful when you want to take a first look at a suspected nasty (like this discussion). It's got a very nice set of features (like telling you how the file has been packed, showing you a hex dump, showing you what libraries/functions have been imported, etc). For me, the best feature is the an ability to view all the strings in the program (just like the Linux strings program).

Cheers,
cgkanchi