>I am just starting to work with C# and I have noticed that the IDE is pretty slow on my 6 year old PC.
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>I know that I need to replace my old system, but what should I be looking for in a new system? What are the hardware considerations that will allow me to get the most out of Visual Studio?

The biggest, fastest machine you can afford ;-) Honestly, go with at least 4GB (just be aware you'll only be able to take advantage of, at most, 3.5 GB of that under the 32 bit versions of Windows). A dual-core is a must. I'd also suggest 10K RPM drive(s), like the Raptor. Visual Studio is a real pig, even on a fast machine. Dual monitors as well. I've got a 24" 1900x1200 and a 19" 1280x1024 and I still wish I had more screen real estate.