In Counter Pack 3 I wrote two kobold-specific Prestige Classes (which appear in a CP3 wallpaper in my website, in the Fiery Dragon wallpapers):
Drakeknight
"My scales shall run red with your blood"
Essentially, they're the flip side of the human shining knight who slays the dragon. The must swear allegiance to a dragon and be able to cast sorcerer spells. As they progress in levels, they learn how to effectively wear armor (reducing Arcane Spell Failure), Embody the Drake (similar to a barbarian's rage, except that it increases Strength, Constitution and gives SR) and Enlarge (growing to Medium size). They also progress their spellcasting powers a bit.
Shadowfang
"Quicker than a dragon's bite, deadlier than a dragon's breath"
Mostly rogue/sorcerers who slay for the highest bidder, but never against dragons. They can sneak around quickly, they get sneak attack, they develop a poisonous spittle, they can do Str damage (and possibly Dex) with a successful sneak attack, they can blink to and from the Shadow Plane, they can use a Shadow version of blur and they develop their spellcasting a bit.