user interface to GiST indices

on the hackers list, there has been mention that GiST indices are 
available as of 7.1 as a partial implementation of full text indexing. 
unfortunately, i haven't seen any mention of GiST in the CREATE INDEX 
docs, and there is no mention of full text indexing anywhere else in the 
docs.

i'm just wondering if there is any way to approximate full text 
searching as of postgres 7.1.

thanks!

-tfo