I reported the .ph spike in one of these threads a while back.
But I haven't investigated further. My speculation is some kinda pre-Panda thing going on. Shrug.
Would be interesting to know what happened exactly.
Edit: I should probably mention my traffic now is comprised of a lot less US gooble referrals and a lot more international tld gooble referrals, relatively speaking.
My intra-day traffic graph is a lot flatter, if that makes any sense.
Not sure if that's a typical Panda 2.0+ thing.