Felon said:Well, I should think the fighter just gains two ranks in one of the related skills, and class vs. cross-class wouldn't be concern.
So, what groups do we get here? Maybe:
Frontiersman (a fighter trained to protect roads and outposts from raiders): Knowledge (geography), Spot.
Interesting idea...but I think giving the Frontierman spot bonus would make that background a no brainer...at least for me. Skills that sees the most use are the most powerful skills in my book (and skills contributing to senses see constant use). Maybe changing spot to survival?

How about these new backgrounds?:
Mercenary (a shady sellsword that has seen more than a few scraps and lived to tell the tale): Bluff, Heal.
Poet Warrior (wise warrior philosopher that dwell on the mysteries of life and death): Perform, Sense Motive.
Thug (street savvy brawler): Hide, Knowledge (local).
Treasure Hunter (spelunking raider with curiosity for the hidden and forgotten): Knowledge (dungeoneering), Search.
[edit: added a few more backgrounds]
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