I myself like the abilities listed here:
1. URL's being trunicated if their too long.
Why: because you'll throw off your page width if allowing huge urls.
2. Images aren't images if they don't have a valid image extension.
Why: Whats to stop someone from saying that an image is a php file... then again you could adjust apacheto use an image extension as a php extension...
I'm actually curious what would happen if you where to set .gif as a php extension on a server and then put a javascript popup in it, I wonder if it'd even work lol...
