I bought a super-handy digital hanging scale from DealExtreme ($10.84, by far the lowest price on the ‘net). The most useful weights to post that I can think of are those of my bicycles:
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Cannondale Synapse Carbon 2 60cm (2007) with triple chainrings, Terry Buzz-Off titanium saddle, two titanium water bottle cages, a carbon micro-pump, and a cyclocomputer: 20.24 Lbs.
Cannondale Super V Raven 3000 carbon (1998, 8-speed rear) with Easton carbon seat post and handlebar, XT rear hub, and Terry Ti-Race saddle: 25.93 Lbs.
Specialized Allez Elite (2000 Allez A1 Elite running gear with 2007 XL carbon and aluminum frame) with double chainrings, single aluminum water bottle cage, and generic seat: 20.24 Lbs.