There are three curse types:
1. Up to four random negative item properties get added while all others are removed
2. The item functions intermittently. It sometimes switches off and then on again. The item properties used are random.
3. The item applies an effect upon being equipped. This can be a polymorph or even confusion. 12 possible effects
//Update 12-09-2011
Fixed all reported issues and added a needed manner to remove curses using the remove curse spell. (needs a small 2da change in the targettype field as the script mentions)
10 - A Masterpiece, Genuinely Groundbreaking 9 - Outstanding, a Must Have 8 - Excellent, Recommended to Anyone 7 - Very Good, Deserves a Look 6 - Good, Qualified Recommendation 5 - Fair, Solid yet Unremarkable 4 - Some Merit, Requires Improvements 3 - Poor Execution, Potential Unrealized 2 - Very Little Appeal 1 - Not Recommended to Anyone