[pmsaue0]

The only reason I might come up with to stick w prototype is that it takes time to switch you app to jQuery. That's the ONLY one. jQuery is too easy to learn; way more community -- and in that regard, Scriptaculous is pretty much dead.

if RoR you can use jRails to try to keep functionality in your app (if that's what you use)

[schammy]

Agree 100%. I was a prototype user a long time ago. When I discovered jQuery I couldn't believe how much more amazing it was. I'm a huge jQuery advocate now and would never in a million years touch prototype ever again. jQuery just makes sense, the code is so easy to write and so legible and logical, and overall is the best thing that ever happened to javascript. I feel bad for anyone still stuck on prototype - you have no idea what you're missing.