Another free site to try is:
http://www.mikogo.com
I downloaded this site two night ago and my client in Atlanta, have been sharing her files with me, instead of her emailing the files. Sometimes, I'll ask her to email files, it would take her a year and day before I get them, so I will call her or email her again for the files. She was oppose to the idea at first, but she succumb to the suggestion after I told her I will charge her for repeating calls for info I needed to complete my task.
Some client don't like the idea of sharing their files, if you have to access their computer. If you work with the client long enough you'll get to know their character. With my client in Atlanta, we have a good relation. Because it is in real time, she has no problem whatsoever.