hypergolic is right with hop utilization. However, through all the 5 gallon extract batches I did before I had the ability to do a full boil, my beers all turned out just fine and delicious. I did not know that hop utilization was affected.
If you are concerned about it a search on here might give you a little info on the corrections to the hop schedule but I'm not sure because I have never looked.
Either way if you haven't read "How to Brew" ( you can read it for free at www.howtobrew.com
) chapter 1.1 - crash course in brewing, describes a run through of a brew day while using a partial boil. Great book/website its worth checking out, a lot of people including myself have used it to start brewing.