I found this useful thread (on the other site) for those of us who would like to use the factory steering wheel controls with Eclipse Head Units. I don't think this works with other brands, just Eclipse. Thank Paradroid_xa (on the other site) for this info. Actually looks like this works with most Toyotas with steering wheel controls...
Paradroid_xA said:$169 head unit: Eclipse CD3000 @ Ikesound.comHondAudio said:Do the factory controls with with Eclipse single-DIN units?
$16 mounting kit: Scosche SCN2056 @ Cardomain.com
$10 wiring kit: Scosche TA02 @ Cardomain.com
Download and create a CD w/ Eclipse -> Toyota steering wheel controls profile and upload to your CD3000.
So... for a shade over $200 (after shipping costs) you can have a very nice head unit, keep your steering wheel controls, and even have 3 sets of pre-outs when you decide to add an amp, upgrade your speakers, and install that subwoofer.
Also, here's a link to the Eclipse CD3000 manual.
if the CD3000 doesn't appeal to you... here is a list of all Eclipse head units that support Toyota steering wheel controls!
P.S. I nominate this post for Stickiness