A spin-off of Antiques Roadshow, PBS’s most popular series, will visit memorable guests from past installments and guide viewers through the ins and outs of the antiques market. Antiques Roadshow FYI debuts early in 2005 as a half-hour weekly magazine program. PBS will pair it with another new half-hour series to be announced next month. PBS announced the new Roadshow series July 8  during the Television Critics Association summer press tour. The network also announced a three-part history series, Guns, Germs and Steel, to be made with Lion Television and National Geographic Television.