[amarraja]

> Sidenote: I wonder if any webapps use randomly generated IDs and class names (linked in the CSS) to prevent scraping. I guess this would be a caching nightmare, though.

These guys do a stellar job on the IP addresses: http://www.hidemyass.com/proxy-list -- the good thing is the data is available for an amazing price.

Other sites I have some across will use large images and css sprites to mask price data.

I write a lot of scrapers for fun, rarely profit, just for the buzz