You can get at least 3 buffs right now:
- Winds of Sanctuary, for your 50% rep/experience (with one exception)
- 10% buff for Dragonflight reputations from the Envoy Charter on Forbirdden Reach for 6 hours.
- 10 buff for both exp and rep from Darkmoon Faire for 1 hour.
The latter two are repeatable and, Death allowing, thats a very handy set of extra experience and reputation.