Tashie is still odds-on favourite to go - she's currently at around 1/4 (1/5 with Betfair).
Harry was 2/1 for a long time, but has started to drift and is now 4/1 with some bookies.
The biggest movement has been Aaron. He's still the outsider for eviction, but today has seen him slip from around 30/1 to 10/1 with at least one bookie. I'm guessing this is just due to uncertainty (first eviction, vote-to-save, etc) and "neutrals" looking for the best-value odds, though...