Sincere thanks to yoyo, and his BOINCers over at yoyo@home:
http://www.rechenkraft.net/yoyo/
who have been running some ECM curves, using GMP-ECM, on:
(M+2)2281, (M+2)3217, (M+2)4253, and (M+2)4423.
Look for an update to the main M+2 website soon, showing remarkable
progress - and hopefully even maybe a new factor!