Portals are awesome. I started writing a small supplement about them, Albert joined, and Carlo Bottiglieri helped a bit.
Now Incunabulum of the Uncanny Gates and Portals is almost ready: I’m checking the material for inconsistencies. It covers portal topics like why are portals cool?, what should I do with them? and how do I build them?
It also comes with a muleload of tables to generate portals and everything related, including PORTATRON, the one-stop-system of portal generation. Soon to be released on PDF and print.
IotUGaP (not an official acronym) also contains The Infamous d666 Quick Portal Destination Table, which does what it says on the tin. Because we wanted to have a d1000 table and have the longest OSR table as some kind of joke, but then we realized that 216 portal destinations ought to be enough for everybody. At the moment the table by itself is 11 pages long. The whole book is 32 pages.
Below are the first 17 entries. 199 follow.
As per use, comments on Google Plus.
Lost Pages 
Wow! nice job. This is exactly the sort of project we would have loved to have been part of, since we do a lot with gates, portals and the like. Looks like a ton of fun.
If I was a fool I’d suggest you to get together and write more soon.
So, yeah, want to get together and write more soon? 😀