Less hard drive space after Lion install

I have a macbook air with a 64 gig SSD, so storage space is at a premium. I seem to have about 10 gigs less space available after the Lion install. Was there files generated during the Lion install that I can delete, like a backup of the previous install, that would free up some of the lost HD space?

SOLVED!
When I ran whatsize as an admin, the first thing I noticed was a .MobileBackups directory chewing up 74GB of space. That reminded me of something I had glanced over quickly in John Siracusa's Lion review on arstechnica.com: http://arstechnica.com/apple/reviews/2011/07/mac-os-x-10-7.ars/18#mobile-time-ma chine
Basically if you are on a laptop, TimeMachine has a local NFS file server (the volume I saw called MobileBackups earlier) that continues to version everything while you are on the road. It appears to store that in a .MobileBackups directory on your primary HD until you plug in to TimeMachine again.
Well that's where my space went. Good to know. Thanks for the WhatSize recommendation. Time to go plug this in to TimeMachine and see it go away!

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