Lots of options here. Action abuse with psionic powers springs to mind - Metamorphosis into a Choker, Schism, Synchronicity, Linked Power... Wizards, obviously, can also do a good deal of fucking with timee, but I can't think of as many related spells off the top of my head. Haste comes to mind, and, of course, the Swiftblade prestige class, which eventually gets 3.0 Haste as a class feature. Action abuse via the Factotum's Cunning Surge could also be reflavored as chronomancy.