I've been mapping in Birmingham for about 24 months having concentrated mostly on the Eastern side towards Solihull. My preferred editing tool is JOSM although I'm building up a healthy regard for Potlatch. Most of my mapping is done by bike
My other areas of mapping activity are the Highlands of Scotland where I add data whenever I'm charging about the mountains trying to complete the Munros.
I generally add data wherever I travel and I've made small contributions to Spain, Ireland, South Africa and the Isle of Man
I have also concentrated on mapping from Yahoo Aerial Imagery the joint cities of Fort Worth and Dallas in Texas - this gives me lots of scope to experience mapping all sorts of features for which there is no scope in the UK. I'm looking forward to having some collaborators on the ground over there!