I see from the "open-vm-tools 2010.04.25 release" announcement
that development is moving on to upstream 2.6.33, and of course
open-vm-tools development should follow the latest kernel.
http://sourceforge.net/mailarchive/message.php?msg_name=4BD72B8B.2020200%40vmware.com

Previous to today I was also happily using open-vm-tools 2010.02.23
on Ubuntu Lucid LTS kernel 2.6.32-21 which is very easy to install with

apt-get install --no-install-recommends linux-headers-`uname -r`
open-vm-dkms open-vm-tools

(If you want the GUI leave off "--no-install-recommends";  thanks to
Dick Visser for the tip
https://confluence.terena.org/display/~visser/open-vm-tools+in+Ubuntu+Lucid  )

Unfortunately today the lucid kernel update 2.6.32-22 no longer loads
the vmxnet module, though it built fine with dkms and the other vm* modules
load. I'm a bit concerned about using open-vm-tools on lucid since it
broke after
the very first lucid kernel update, and development has moved on.

I definitely don't want to be stuck choosing between an old
unsupported kernel or
bleeding edge (as I often was with precompiled VMWare Tools modules).

Is it worth using open-vm-tools 2010.02.23 on lucid?
What are others' plans?

By the way, here's a dumb example of the performance difference between
pcnet32 and vmxnet on the same VM:

Downloading a 4GB DVD.iso file to /dev/null (no file I/O):

wget http://local/dvd.iso -O /dev/null

pcnet32 on 2.6.32-22-generic-pae:
100%[=====================================================================================================>]
4,376,366,672 13.2M/s   in 5m 41s


vmxnet on 2.6.32-21-generic-pae:
100%[=====================================================================================================>]
4,376,366,672 29.0M/s   in 2m 9s

It's also possible to get an e1000 device by adding this to your vmx file:
ethernet0.virtualDev = "e1000"

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