Hardware

We have two DSL modems (one old and slightly creaky, the other brand-new) and a wireless router (older, works fine) that have been obsoleted by our switch to cable internet and the fancy all-in-one modem/router/wireless/firewall box we got for free* with our sign-up deal.

What should I do with the old hardware?

We don't need it, but it's Still Perfectly Good™, so I can't just throw it in the trash or the karmic waste-management pixies will smite me.

*Must go xerox UPC barcodes and mail in rebates...

ETA:
Old DSL Modem: Zyxel Prestige 645
New DSL Modem: Broadxent 8012-V1
Wireless Router: D-Link DI-524