> Err... on a TO-92 case, the base is the middle one, right?

Not always, but generally. Although if you're used to working with
particular parts it may be that those *do not* have b in the middle,
so then "generally" would not be true

> How do you know which is the emitter and which is the collector?

You could check against this

http://www.fairchildsemi.com/ds/2N/2N3904.pdf

As an established industry part, what you have probably conforms

Double-check

http://users.otenet.gr/~ATHSAM/theory/Transistor_test_type_and_polarity_eng.
htm

Maybe your multimeter has a transistor tester built in ?

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