VMware is the very reason I now run Virtualbox
VMware Server 2's failure to install on Debian 5 was the very reason I switched to Debian 6 and the newer Virtualbox version it included.
If Virtualbox Commmunity Edition can be kept running happy through my Debian upgrades then VMware should be able to do so; even if it means working closer with kernel developers on the vmware kernel modules.
I'm just happy that Virtualbox makes bridged networking as a simple option in the VM guest config. I can live without the "start at host bootup" checkbox but my use of VMs relies on being able to bridge them in as separate logical nodes on the network.