okay... this isn't strictly for the Vibrant but I noticed it now and it is extremely useful... the app is called Awesome Drop (it's free on the market)... it allows you to transfer files between a PC and your phone... in the most SIMPLE way i've ever seen without using cables...
You open up the browser... to
http://labs.dashwire.com (go there now it has a video of how the app works)...
then you open the app on your phone...
on your phone you put in the code that appears on the website... and it will link your phone and the site, changing the top of the website from a number to a "Drag Here" green box...
Simply drag the file/files (yes it does multiple files) from your PC to that green box and it will start copying to your phone...
This app is extremely helpful if you have a small file or a couple small files you want to copy over, like ringtones pictures even full songs... it does NOT work too well with extremely large files like movies and stuff but hey for those situations i'm sure people wouldn't mind using a cable...
Anyway i hope you guys find this app as helpful as i have!
Enjoy!