Jammy, I'm only on 4,880. Although to be fair, my total didn't reach that high anywhere as fast last year. Indeed, March 2012 saw me get 2,289 of my year's total so far, an impressive amount.
My Irish trip brought a lot of mileage to 2012's total, including the UK mileage. 1,517 miles and 37 chains, and that's not including mileage for some of the moves

hock:

Also got another Irish trip coming up, on which I plan to spend a day in Dublin on the Luas system, as I need all of it bar Connolly to Heuston. Won't be as big a mileage trip as last time, but should see me get most of the trams I need for sight. Didn't know 5001 - 5026 existed, so got something like 39 trams to still see and all bar 3 of them to bash!
EDIT: Just updated my mileage thing and I see I'm now 16th. Looks much better than it did before, and I've realised I'm almost 1/4 the way to achieving my mileage target for 2012. With an anticipated 10,000 due to come off my ALR, I don't see myself struggling to hit the target, and we're only a little over 1/4 the way through the year!
