The Projoom Banner ad rotator does exactly as it states. Running on flash to basically take your ads and push them out into a more "flowing" system on your website will make it look more professional. WE have mixed .gif's, jpgs and .swf all running on the system with no problem.
When we upgraded to version 2.x a couple of days ago we had an issue.. the projoom staff quickly helped us over to fix the issue (which was a .htaccess issue)
As stated earlier, version 2.x just came out with more features and unlimited banner ad sizing...
So the Extension is perfect for our needs and support was quick and responsive!