Thanks, very useful.
(edit) Unfortunately though that image doesn't boot. After writing it to a USB stick with win32diskimager and trying to boot, I get "Syslinux error: no configuration file found No DEFAULT or UI configuration directive found" and a boot prompt that doesn't do anything. I tried another USB stick, same result.
I see someone else has had the same problem: https://bitcointalk.org/index.php?topic=65915.msg794424#msg794424 no solution posted apart from "download again" which I did, no change.
(edit2) ah, I'm not the only one. https://bitcointalk.org/index.php?topic=65915.msg800875#msg800875 that page has several people with the same problem. Does anyone have the image with fat16 filesystem that is talked about there? The one from bitcointrading seems to have the flawed fat32 filesystem. FWIW, the motherboard I'm trying to boot this on is an Asus, not a Gigabyte.
(edit3) I've managed to recreate the BAMT 0.5c with fat16 filesystem, by reformatting the 525MB partition, copying over the files and reinstalling syslinux (latest version, 4.05) - and now it boots. It looks like indeed some motherboards have issues booting from fat32 USB sticks.