| Ross Byers RPG Superstar 2008 Top 32 |
The Rise of the Runelords, Curse of the Crimson Throne, Second Darkness, and Legacy of Fire Adventure Paths were written under the 3.5 rules, so you should have no problems at all.
The Council of Thieves, Kingmaker, and Serpent's Skull Adventure Paths were written for the Pathfinder Roleplaying Game, so they are designed to be backward compatible whenever possible.
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Curse of the Crimson Throne was written for 3.5, as was Rise of the Runelords, Second Darkness, and Legacy of Fire. So, they obviously work just fine with 3.5 rules :)
The adventure paths written for PFRPG are Council of Thieves, Kingmaker, The Serpent's Skull, and all future ones. They will work with 3.5 rules with minor conversion work.