I'll probably start a rogues gallery thread eventually, especially once the campaigns start using more homebrewed NPC's and fewer module-creations.
As for Yip:
Advanced Kobold Racial Traits
+2 bonus to Dexterity and Charisma, -4 penalty to Strength.  Kobolds are both fast and agile, but they are smaller and physically weaker than other races.  Kobolds also possess a great sense of self-worth and confidence that belies their short stature and mosterous appearance
Small creatures with a Base speed of 30 - kobolds are capable of scurrying as fast as any human can walk, and often outrun creatures of similar size such as gnomes and halflings.
Darkvision 60 ft.
+1 natural armor: kobold scales are tough enough to offer some protection in combat.
+2 racial bonus on craft, search and disable device checks that are related to traps.  Kobolds are familiar with most types of traps, and possess a near sixth-sense about the intricacies of trap design.
+2 racial bonus to move silently.  Kobolds are light on their feet and notoroiusly quiet when they wish to be.
+2 racial bonus on craft and profession checks that are related to stone.  Kobolds are skilled miners and stonemasons.
Automatic Languages: Common and Draconic.  
Favored Class: Sorcerer.