Sandman variant for the Bard(apg) + 1 level of Spelltheif (compAdv) + Master Spelltheif Feat (compScndrl) = All the fun spell theft abilities of the sandman, plus stealing spells as a spelltheif of your level.
Scout Variant for the Rogue(apg) + 3 levels of scout (compAdv) + Swift Ambusher Feat(compl Scndrl) = at level 4 rogue (ecl 7) you can get skirmish and sneak attack damage every time you charge. At rogue 8(ecl 11), you can get them both on the first attack of the round anytime you can skirmish.
Any more fun APG/3.5 builds like this?
Archivist Bard archtype (APG) + Knowledge Devotion feat (Complete Champion) = lots of fun.