Xcode and Lion on a MacBook 2007? I'm considering buying a used MacBook (mid 2007 model) with 2GB of RAM and Mac OS X Lion. I am going to use this as a secondary computer to learn iOS development and to become more familiar with Mac OS X in general. Will this hardware be usable as a secondary machine, or is a 2007 model to slow to run Xcode and Lion?
It might be a bit slow. I am using an early 2009 MacBook with 4GB of RAM, and the performance of Lion wasn't as smooth as Snow Leopard. 

For the record, I am also running Xcode. It runs OK, not exactly smooth. So I think your experience on 2GB RAM might not be too pleasant.