There is no one line I could write which would work for every site. Amazon uses a completely different URL to freeipods.com for example. Btw ECPhosting, all those lines can be combined into one, and it is of no benefit to anyone who wants to put their own ID in there. However, you have a nice list of sites in there so I'll write a regexp for all gratis sites tonight

The main idea of this is not to censor them, as you can do this with replacement, but to replace their ID with yours.
Cheers,
- Dean