Just thought I'd update everyone as we all know rooting is popular on the HUKD community.
If you root your Samsung Android phone, you are voiding your warranty with Samsung. This means if your phone develops a fault (i.e. touchscreen stops working) within 2 years of purchase, it may not be fixed under warranty, if they find out it has been rooted.
This is especially important on phones like the Galaxy S, which most places (if not all) will charge in excess of £100 to fix a touchscreen or display issue unless it's under warranty.
The reason I'm posting this now is because Samsung have only this week implemented a system for Service Centres to check if the handset has been rooted.