A common ask, using MOSS Workflow and InfoPath 2007 with a form library to handle basic business needs such as Travel Request forms.
This isn’t anything earth-shaking or new, but it is the really valuable core functionality of MOSS that is fantastic to share with customers.
Keep it on hand for passing off to your clients and their power users that are trying to make SharePoint more valuable for their company:
http://msdn2.microsoft.com/en-us/library/bb267332.aspx
It’s also a great 5 minute demo that goes a long way to selling your client on a MOSS install. (Which is the situation that reminded me to drop a link on the blog.)