A re-post from April, 2005:
I keep a pair of cheap Nikon 7X35 compact binocs in the car, just in case I happen to encounter an interesting bird. They work very well as opera glasses, too.
For marine use - not for birding but for looking around - I like a 7X50. Mine are inexpensive but good enough, and with the exposure to salt water and banging, I don't want to worry about them.
For more serious birding and nature-watching, I like my Minox rubber-coated 8X32s. Darn good lenses, and you don't want additional magnification for wildlife except in special circumstances.
The cool birders who want to spend the money use Swarovskis - but the very best birders I know can ID any bird with any old cheap compact binoculars, unless they are distant, on a beach or prairie. Then a spotting scope is essential.
Great source for binocs - Binoculars.com. They also have night-vision optics, spotting scopes, and rifle scopes.
Photo: Swarovski 8X42s.