I've just bought a used T61 for a good price ($200). The laptop is still on good condition, and plan to use for another 1 or 2 years (so from 2011 to 2012). Main uses are doing web development, and probably a .NET development.
Is the machine (C2D 2.40ghz, 3GB DDR2 RAM, 250HD) could handle these tasks? I'm saving for a new X or W Series Thinkpad and it would probably take me year to get one.