I had no problems with the kernel upgrade (2.6.24-21-generic) on my desktop or laptop. My wireless driver (Ralink rt61) on the laptop, and the nvidia driver for my gforce 6200 (nvidia-glx-new from Ubuntu repos) on my desktop are still working fine.
If anyone is having trouble with their wireless drivers, install the "linux-backports-modules-hardy-generic" package if you have not done so already. If you run "sudo aptitude show linux-backports-modules-hardy-generic", or search for it in synaptic, it says:
This empty package allows people to keep their backported modules up to date when upgrading their linux kernel
Someone on the Ubuntu forums told me to install this to keep my Ralink rt61 drivers updated. It should keep other backported modules up to date as well.