XPpro has all the business and networking capabilities and administrator controls XP home doesn't have.
If you are using the laptop to log into a business ethernet or network you may want this.
Otherwise, if using it at home, some drivers and support for consumer products if not in XPpro.
I've heard alot that XP Pro is faster then XP Home...i wanted to know why! and if its true!....I used both before and i see no difference....yet pro is more expensive....whats the difference?