Is there a good reference guide for decrypting HTTP agent strings?

We get some odd errors reported on our website and try to find out some details about who is looking. I look at sample user agent lines and see things like:

Mozilla / 5.0 (Windows; U; Windows NT6.0; en-US; rv: 1.9.0.6) Gecko / 2009011913 Firefox / 3.0.6

Now some of them are obvious, but some are less so ("U"?). Following the pattern of hits, I suspect that it was a robot, but I don’t see anything that I recognize in this line to push me to this. I would like to know what some things mean in this (and other) lines. Is there an exhaustive link somewhere?

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Wikipedia 'U'.

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User-agent ( ) , www.useragentstring.com , .

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Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv: 1.9.0.11) Gecko/2009060214 Firefox/3.0.11

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Mozilla/5.0 -
Macintosh -
U - 256-
Intel Mac OS X 10.5 -
en-US -
rv: 1.9.0.11 -
Gecko/2009060214 -
Firefox/3.0.11 -

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User-Agent, . , , curl -A user-agent-here.

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