Thought my little invention is worthy of being called a gadget, so I think here's a good place to post.
I just got done whipping up a working auto-inflating personal flotation device, and I now have it for sale at my vendor at Caledon Glengarry 47, 197, 29 and I have also made it available on XStreet (Auto Inflating PFD).
It's 175 L$; comes with the inflating vest attachment, vest avatar clothing, and directions for use.
It auto triggers at a good depth in case you use a boat with low clearance from the water, and works great with most swimming HUDs.