The other hassle is having to
 essentially rebuild an Win98 (or any
 other) machine from scratch in order to try to replicate an existing
 setup.  I haven't seen any way to "capture" an existing machine and all
 its disk partitions -- especially when there's multiple partitions of
 different types
 -- and import it into the virtual
 world.   That'd be great. 
Not for free but AFAIK VMWare Pro allows you to do this.
-Ali