Saito was the Dodgers closer the past three seasons, and missed some significant time last year due to a strained elbow tendon. He did return for six outings in September and was effective. The Dodgers elected not to re-sign the veteran, who turns 39 next month.
Saito will probably be used as a setup man for Jonathan Papelbon, but could be used as a closer on those days when Papelbon has been used in consecutive days.
It's been a winter of "low-risk, high-reward" signings for Theo Epstein, and Saito is another one of those. It now appears that the Red Sox have just one more roster move to make before Spring Training begins, and that is who will be behind the plate along with Josh Bard.
I haven't heard of a single other offer that Jason Varitek has received. I guess his agent, Satan, is having a tough time drumming up any interest for him around baseball.