Ive done
http://essayfarm.com was a site I built about a year ago, still running havent touched it for a couple of months houses 20 thousand essays good example of managing large amount of data, uses both mysql and files, has approximately 5000 members
Dont really make any money with it, so its for sale
http://excessivehits.com more recent site a traffic exchange was built fast, but has 3000 members 300k hits per day 3000 members and uses mysql mixed with files to optimize performance.
Right now its hosted on a very crappy host, will move early next month to my server.
Good example of work if your looking into something like managing/selling traffic etc.
Have experience with coding all types of scripts, so just message me and Ill give you a quick estimate.
Mike just because I charge less than you doesnt mean that I am less than experienced. I also have more examples of client work, however do not want to post that on forum, so message me for details.