Hello,
Here is an article about small systems -
here.
Of all of them, I like fit-PC and Linutop the best. I wouldn't consider those built on non-AMD processors (I only work with AMD - I'm silly that way).
Things I like about both - they're small, low-power, interesting in concept.
Things I don't like (just from reading the literature) about the Linutop: runs on only 1GB of flash memory (come-on! for the price of flash memory, this should be at least 4GB, if not 8); it seems almost married to Xubuntu and Gentoo; seems quite expensive for what you get; no PS/2 port
Things I don't like (just from reading the literature) about the fit-PC: runs on a traditional hard drive; hard drive should be SATA; only has 256MB RAM (should be at least 512 - especially since you can't upgrade); can't upgrade RAM; no PS/2 port