I know it's not quite a thin client, but I have a Shuttle XPC SK41G as a Win98 box. IMHO it makes just about the perfect small PC for 98 - fast (Athlon XP 1700+), decently-compatible onboard sound, a universal AGP slot that can support 3.3V (i.e. Voodoo) cards, a spare PCI slot for whatever you want, and a BIOS that handles large drives (tested 160GB in mine.) The only things I really wish it had are a built-in MIDI/DB15 port for the onboard sound chip, and better voltage/overclocking controls in the BIOS (there are NONE.)