[InTheSwiss]

Have a read of http://en.wikipedia.org/wiki/Amazon_Standard_Identification_...

That is how Amazon can maintain such good link backwards compatibility although for books this is even easier as it just has to parse the ISBN and job done. ASIN allows them to tag everything ever on Amazon and keep it linkable. Good future planning from back in the 90s though I guess.

[makmanalp]

Wow, I'd always wondered what the heck obidos was: http://en.wikipedia.org/wiki/Obidos_%28software%29

[blueskin_]

Amazing.

I wondered that on just about every link. Same with old BBC News links with /hi/ (if anyone knows what that one is, go ahead).

[ToastyMallows]

Thanks for the link. Very good planning indeed.