Just wondering how you guys delete the projects out off Sony Vegas? Do you just delete the files off the computer and thats it or is there a way to clear them out of vegas too?

Deleting the project file is all you need to do.

i always start a project in it's own folder and everything required for it is also added to that folder. when the project is finished the folder is backed up to an ex hd (and the clients if requested). then the project deleted in vegas and finally the folder deleted as well via win explorer.