Added loads more street names to the Streatham/Norbury area with my combination of 125cc trail bike, Garmin GPS and an iPhone to take the pictures.
It's great being able to load the geo-tagged pictures into JOSM along with the track, but I find that JOSM gets a bit confused if I take two pictures too close together (physically). Maybe it's the iPhone's dodgy GPS or it may be a problem with the JOSM geo-tagging plugin. Either way, it causes the photos to go out of step with the next one appearing where the last one was (if that makes sense).
Anyway, to get around it, I just make sure I take a good picture the first time every time!
Down side to all this setup when out OSM'ing, is I have to constantly leave one glove off to be able to get the iphone in and out of my pocket to take the pictures which could rule this out as an evening activity in the winter. Still, I may have all my local roads named by then 8-)