Entourage (5pm, HBO2) - In anticipation of tomorrow night's season 6 premiere, HBO2 has a marathon of season 5 that lasts till 11pm. 

Harper's Island (9pm, CBS) - He/She who shall not be named (hate to spoil it for those who might be behind) continues his/her murderous rampage on the island, while the survivors try to kill him/her first. There's a second episode at 10pm, which is the ultimate finale. If you don't mind some spoilers, there's a good interview at TV Guide with show star, Matt Barr.

Eli Stone (10pm, ABC) - Eli and Keith help a woman in need of a heart transplant who clashes with the donor's family because of her religious views. This is also a series finale.

Groomer Has It (9pm, Animal Planet) - The three remaining contestants must create grooming instructional videos. 

Harper's Island (9pm, CBS) - An explosion destroys the marina as the surviving wedding party members try to leave the island via boat. 

Eli Stone (10pm, ABC) - ABC finished up the unfairly-cancelled "Pushing Daisies" last week, so tonight they taunt you with another show you probably wish they'd kept around a little longer. Behold the last few eps of "Eli Stone."

Man vs. Cartoon (10pm, truTV) - A pair of rocket-powered roller skates are tested by a stuntman. For real.