The T61p 15.4 inch comes standard with WSXGA+ resolution upgradeable to WUXGA. Graphics is a NVidia FX 570M.

The T61 15.4 inch comes standard with WXGA resolution upgradeable to WSXGA+ with a lesser graphics chip.

If you are thinking to go for a WSXGA+ resolution, the T61p will have faster graphics than T61.

http://www.mekong.net/tech/vidres.htm

I have been using 15 inch 1600x1200 UXGA on my home PC (A31p) in the past few years while using 14 inch 1400x1050 SXGA+ on my work PC (T41/T60). My wife had been using 15 inch SXGA+ (A31).

UXGA is very good when you are a multi-tasker with many windows open. It is harder on the eyes for text, not much difference for graphics. The SXGA+ especially in 15 inch size is a great size if you don't usually have many windows open. I need SXGA+ on my 14 inch office computer due to large spreadsheets.