My desktop is OS/2 only but my laptop triple boots Win98-OS/2-Linux.
98's used for after hours support - I'd rather VPN than drive to the office.
Linux is mostly used to rip CDs for my Linux based MP3 player. It'll see more use if the side venture pans out.
At this time I don't use 98 or Linux often enough to warrent dedicated hardware.
One thing I find interesting - under Windows and Linux the display won't go beyond 64K colors when I'm using the native resolution(1400x1050). Under OS/2 I can get 16.8M(don't know if it's 24 or 32 bit).
My desktop system at home is OS/2 only.