Lpc2000

This is the best comparison I've seen of these popular families. I 
didn't see you mention Ethernet but maybe that's not a concern for you.

The AT91SAM7X256 should be out by now and that looks great - you might 
want to look at it.

One issue that concerns me: there's an open source downloader to 
program flash on Philips devices, but nothing like that exists for the 
Atmel devices yet. As I understand it (someone correct me if I'm 
wrong), there's no linux downloader (of any kind) for SAM-BA, and 
there's no commandline downloader for Windows. 

Commandline downloaders are convenient to use with various IDEs that 
don't have built-in JTAG support. An open source downloader gives us 
IDE authors a good example of how to integrate support for it into 
IDEs.

I didn't check to see if Atmel fully documented the SAM-BA API, but it 
seems like its closed. They also didn't seem to publish the API for 
their DLL either. Or maybe this stuff is documented somewhere, or 
maybe it will be soon. Atmel seems like a fairly open company so I'm a 
little confused about this.

However, it's also fair to point out that Philips does not support 
programming flash over USB at all (you could roll your own code, of 
course). but Atmel does (if you can make use of their Windows GUI 
program).

Eric