Here are links to the official page for both Buffy and Angel and Eden Studios the creators of the game and the Unisystem itself.

As well as being a wonderfully constructed web site, this the resource I took the majority of the adventures for Pittsburgh Problems. Grey Elf's campaign is also the normal campaign of Anita and Cyan, who appeared in Emotional Problems.

The above banner is a link to DrivethruRPG.com, which is the number one online resource for Roleplaying in PDF format. All of Eden's books are available, even before they get to the shops occasionally, mainly because they don't need to go the printers or be sent to the shops.