And are waiting for his decision. He does seem like a very good fit.
-- After his horrendous tenure in St. Louis, Linehan is probably seeking job stability (i.e., a multi-year contract). That was the reason why Linehan left his high-powered offense in Minnesota for the AJ-Feeley-Dolphins, because Mike Tice was on his last year and Huizenga was offering a multi-year contract. The 49ers want stability at the OC position, and Singletary just signed a 4-year contract. I wouldn't be surprised if Linehan wanted a 4-year contract, Niners initially offered a 2-year contract, and the offer now on the table is for 3 years (which might explain why Linehan needs to think it over?).
-- Linehan loves to use the base formation, with TE and fullback getting a lot of snaps (he's apparently not a big fan of multiple-WR spread formations). In particular, he relies heavily on the TE in both the running and passing game. The 49ers have a high-profile TE who can block, and a dearth of WRs; seems like a good fit.
-- Linehan has a history of emphasizing the power running game and the vertical passing game. But some of the deep-ball reputation comes from having Culpepper and Moss in Minnesota, so it's questionable whether he is truly a fan of vertical passing, as opposed to the West-Coast style (Shaun Hill hopes not, Alex Smith hopes so).
-- From all indications, Linehan's style of offense sounds exactly like what Singletary wants: simplicity, not a lot of formations and complex reads, let the QB audible, a lot of base formation, an emphasis on power football.
Sounds similar to what Norv Turner brought to the team in 2006. But again, the only question is whether Linehan favors a vertical passing attack (like Norv), or a short passing attack. That'll probably be a critical factor in which QB gets the nod.