The Exemplar PrC (Complete Adventurer) also gets all class skills, with 8+Int/level skill points.
Able Learner (Races of Destiny) will let you buy cross-class skills at one skill point per rank, but it doesn't increase the max ranks in cross-class skills.
The feat Open Minded (Expanded Psionics Handbook) grants five skill points once, and it may be selected multiple times.
There are several feats in Complete Scoundrel that each grant two bonus skill tricks; normally, a skill trick costs two skill points, and you can normally have only one per two levels and gain no more than one each level.
The Uncanny Trickster PrC (Complete Scoundrel) has 8+Int/level skill points and grants a bonus skill trick each level, and two of its three levels advance class features of another class.