Before I jumped headfirst into this industry with
www.thethrillhammer.com my last "real" job was at x10.com helping them put together their marketing plan for those wireless cameras. Sorry about the pop-unders.
Yeah they are not the best cameras out there but for the pricepoint they are OK. They have a few differnet versions of the wireless cam which operates with a 2.4GHZ sender/receiver.
One is a wide eye which gives a 120 degree field of view, a low light version, and the standard camera. The picture quality is somewhat shitty but for a cheap solution they do the job. For the garage they have one built into a floodlight.
If you need a cheap ass wireless solution they have a product that can be repurposed for use with better cameras. They have a "entertainment anywhere" product that allows you to transmit stereo audio and video wirelessly. It takes RCA inputs.
I personally use a couple of cams just to monitor activity in my studio when I am away and it does the job for that. The real cool stuff they have is the home automation products that they have been building since the 70's.
If you are going to spend a bit more go with a 802.11 product.