I am developing mixed feelings about how to map for OSM.
I've made traces of roads that don't appear in Yahoo! imagery with my GPS and uploaded them. However, the mailing lists have provided WMS imagery that can be used in JOSM to achieve the same result. Heck, it's usually better than the GPS track. It is also much less work to trace an area in JOSM than it is to go out there, traverse the roads, upload the track and trace an image from it.
There's a feel good component to "beating" Google/Bing/Yahoo with a new road. But it starts to feel like wasted effort when I can find imagery that is new enough.
Worse, manual effort seems like a waste when bulk data can be uploaded. For example, if Portland OR has data on which roads have bike lanes, it could probably be part of a bulk upload. Meanwhile, I'm pinging away tagging bike lanes as I find them. Ditto for hiking trails: why bother to add them by hand when someone might do a bulk upload from US Forest Service data?
Does anyone else have this feeling? Imagery rules over GPS? Freeing data for bulk upload or adding little bits by hand?