I wish you the best of luck. I'm currently finishing up my honours thesis, I conducted an online survey of university undergrads last semsester. At times I feel overwhelmed with my 155 respondent set of data. I could not even imagine having more! In my opinion, doing the survey online is the way to go, especially if your survey is quantative, it makes the data analysis so easy.
Here are a few links that may help you out
http://davidmlane.com/hyperstat/index.html
http://www.tufts.edu/%7Egdallal/LHSP.HTM