Originally Posted by shutterpuppy 
The older lenses are quite heavy though..
Some are, to be sure, but the "M" and "A" series lenses are generally quite compact and lightweight. Since they are mostly metal rather than plastic, they are a little heavier than modern equivalents of the same size, but the small size of the "M" and "A" lenses often counteracts that. The 28, 35, 40, 50, and 100 (non macro) from the "M" series are all lighter than the kit lens.
Most of the older "K" series and the various Takumar / M42 lenses, and third party lenses are another matter entirely, though, sometimes weighing almost twice as much as the "M" version.