Lpc2000

I am new to ARM development with plans to use the Philips parts.

I have several questions:

1) What is the best source on how to get a GNU tool chain up and
running on Windows XP? 

2) Will that tool chain work with the Keil ULINK JTAG device, or are
there other JTAG devices that might be more appropriate?

3) Does the GNU tool chain mess up my existing cygwin installation?
cygwin only allows one version to run at a time (they claim to only
allow one on a machine, but there are ways around that). Does it make
sense to compile the tool chain under my version of cygwin?

4) This list looks like a good resource for ARM development. What
others should I look at? Where are FAQ's?

5) What is the best reference for the instruction set, in case I need
to drop into assembler?

Thanks in advance.