is a very powerful ultra portable, comes with Sandy Bridge Core i3/i5 (or i7 if you wish to drop $$$), 12.5'' 1366x768 (optional IPS screen, very nice for photo editing), very nice laptop for the money.
+1. good reviews on it. Get the baseline X220 (not the X220i). Note that it comes with one 4GB DDR3 SDRAM 1333MHz SODIMM. Buy another 4GB stick for $25 to get dual-channel performance and to beef up Photoshop speed.
Windows 7 with 2GB RAM would be useless - especially running image processing s/w.