Main machine has 16, wishing it was 32. I do a lot of work with VMware on this machine and 16gb doesn't go very far. Once you hit the limit, things turn ugly. This is the one I used for the poll since I use it all day every day.
My big laptop has 32GB, but it weighs as much as a small child. I should sell it and buy an ultrabook.
Smaller laptop (Dell M4500) has 16GB, but I rarely use it.
Other machines in the house:
Win2K8 Server has 8GB
A machine I have set up for use as part of a Cisco Lab has 6 Gb Ethernet ports and 12GB of RAM.
A VMWare ESXi test machine has 16GB
Bedroom HTPC has 8GB
Living room HTPC has 4GB
Upstairs HTPC has 4GB
Tablet PC has 8GB
iPad ??? 1MB?
Most of the RAM was bought when it was less expensive. I looked into upgrading my desktop a couple weeks ago and couldn't believe the cost for a 2x16GB @ 1866+. Needless to say I will stick with 16 for a while.