That's just from a quick google. Back in the day there were stories of "A Visit from Mr. Brown" or something like that. The NSA or "some agency" would go around to anyone making crypto or operating systems and ask to be given backdoors in exchange for deals on export restrictions. Periodically a government agency in another country would find them and we'd be embarrassed. These days it's not as common since crypto exports aren't restricted (much) so the threat of, "If you don't add a backdoor we'll label your software a weapon and you can't sell it to the world." doesn't work.
Then again, could all just be a huge conspiracy.....mwhahahaah.
http://www.schneier.com/crypto-gram-9909.html#NSAKeyinMicros...
So other than this, are there any other NSA "backdoors in everything from crypto systems, operating systems, to even backdoors themselves"?
The great thing about backdoors is, when they get discovered they have perfect plausible deniability. "Oh that key named NSAKEY isn't for the NSA it's for...uh...this other agency. Yeah that's it! It's not even a key. Right Bruce? Right?!"
The great thing about people accusing others of subterfuge is how it may never reach a suitable end.
How do we know Zed Shaw is not a shill for those opposing those for whom Bruce Schneier is a shill?? What to do!