I was just about to ask the same question...haven't been able to afford a GPS yet. My girlfriend and I are just getting started...found our first two today and are working on the third using only Google Earth and our general knowledge of the area (how little we actually knew). We're lucky so far because Chicagoland is a reasonably high-res area in Google Earth. I'll also take snapshots in G.E. and put the picture on my PSP to take with to compare landmarks on the go. It's great so far except that the PSP's screen is totally crippled by the tiniest bit of sunlight...I have to duck under my coat to view it outside. I definitely intend on getting a handheld GPS though...I've wanted one ever since I discovered G.E. and even moreso now. It'll make simple directions like "go 270 meters south" a LOT simpler.
