The idea must be in the ether! I just spent the last two days obsessed with this, having decided to make another stab at Bitcoin.

I now have a neat method worked out that I can do on the fly in my head, and a little Python script to check it.

Sorry I don't feel like sharing any actual tricks/code, but here are a few examples. Whatever the site address, it spits out a password from 13 to 20 characters in length. If anyone can explain my algorythm, I might even send you a Bitcoin!

https://news.ycombinator.com -> 0$$onew$vwqitt&10

http://slashdot.org -> 4$$guola$fwqivt&13

http://arstechnica.com -> 25$bars$jwdibt&15

http://www.theverge.com -> 4$$gthe$twggt&11

http://www.ibm.com -> 49$tibm$jwcint&17

http://www.wired.com -> 81$fwir$swfid&18