A list of arbitration-eligible pitchers isn't the definitive list of pitchers available in trade, but it's a good starting point. It's a list of players who might outgrow the budget of their developing team, and players who will use arbitration to massage the dollars-to-suck ratio in their favor.
Again, MLB4u.com has the most comprehensive list of arbitration-eligible players I've found on the net. It also has a good description of arbitration rules. For example:
Players who have three years of service time, but less than four, will subtract the difference of their service time and pi, calculated to the number of places corresponding to their uniform, unless they have less service time in years than pi, in which case they are considered "Super-3.14" status players, and will be eligible for double-secret arbitration. Note that Felix Pie is exempt from this rule, instead qualifying for "Felix-3:16" status, and that you should always keep some pie around for Livan Hernandez to keep him happy. You wouldn't like him when he's angry.
From their organization's "cold, dead hands"
Josh Beckett
Jeremy Bonderman
Carlos Zambrano
Dontrelle Willis
Brett Myers
Jason Marquis
Oliver Perez
Jon Garland
Valuable and cheap enough for their current team, thus probably not easily available
Aaron Harang
Tomo Ohka
Horacio Ramirez
No thanks
Leads Majors in Terrible late-'90s Grunge Rockin' above Replacement (T9G/R), and should be retained by Boston, but worth looking into.
Should also be retained by Boston, but worth looking into
Past history of success, recent history of average-to-bad pitching, about to have that past history influence their present earnings on a team that needs help in other areas: The perfect trade partner storm
Ted Lilly
Vicente Padilla
Kip Wells
Could come cheaper than other options, but about as reliable as Kevin Correia
Pitchers I just don't trust
The Giants don't have a heck of a lot of things to offer up in trade, but there aren't many on that list that would seem completely out of reach. It seems at first glance this is a slightly more promising, albeit limited, group than the bottom-feeders from yesterday's list. However, Lilly and Wells had awful seasons, both with walk rates jumping high enough to make me seriously wonder about their health. Padilla was coming back from an injury, and his numbers weren't terrible. I would make a push for any of the three if the price weren't outrageous, but not be surprised if they all implode. Or re-implode, in the case of Wells and Lilly.
The Giants are going to need to take a risk of some variety this offseason. They are going to have either take a risk with a fat contract to a quasi-ace pitcher like A.J. Burnett or Kevin Millwood, or they're going to have to pin a heck of a lot on a downtrodden pitcher to have a bounce-back year. There is no room for the team to dip into limited resources for non-descript pitcher like Lohse, for example. Unless it's March and the Giants are still counting on Kevin Correia, Lohse and free agents like Jason Johnson should be out of the picture. The reward of a slightly below-average innings-eater is too meager; the visible upside is sub-Tomko.
I'll try my best to collect some other rumored trade options for tomorrow. I have David Wells, Tom Glavine and Jason Jennings, but if you could jot down some names you've heard in the comments section, that'd be just dandy.