What we're watching: Our summer HDTV schedule gets a boost tonight with the return of The Closer on TNT, followed by the series premiere of Heartland.

Our traditional high-def listings continue below.

Here are some other HDTV programs showing on selected networks today. All times are Eastern and reruns are in italics, finales in bold:

ABC (720p): N/A

CBS (1080i): Creature Comforts (8 p.m.), The New Adventures of Old Christine (8:30 p.m.), Two and a Half Men (9 p.m.), How I Met Your Mother (9:30 p.m.), CSI: Miami (10 p.m.)

NBC (1080i): The Tonight Show with Jay Leno (11:34 p.m.)

Fox (720p): N/A

CW (1080i): Everybody Hates Chris (8 p.m.), All of Us (8:30 p.m.), Girlfriends (9 p.m.), The Game (9:30 p.m.)

MYNTV (1080:): N/A

Discovery-HD (1080i): Meerkat Adventure (7 p.m.), Risk Takers (8 & 11 p.m.), Tank Overhaul (9 p.m.), Comet Collision! (10 p.m.)

TNT-HD (1080i): The Closer (6, 7 & 8 p.m.), The Closer (9 p.m.), Heartland (10 p.m.)

ESPN-HD (720p): SportsCenter (6 & 11 p.m.), MLB: Red Sox vs. Braves (7 p.m.), Baseball Tonight (10 p.m.)

ESPN2-HD (720p): NASCAR Now (6 p.m.), College World Series: Arizona State vs. Oregon State (7 p.m.)

Mojo HD (1080i): London Live (7, 7:30 & 11 p.m.), Geared Up (8 p.m.), Wall Street Warriors (8:30 p.m.), I Bet You (9 p.m.), King of Miami (9:30 p.m.), Three Sheets (10 p.m.), Uncorked with Billy Merritt (10:30 p.m.), Howard Stern (11:30 p.m.)

HDNet (1080i): HDNet World Report (7 p.m.), Smallville (8 & 11 p.m.), Star Trek Enterprise (9 p.m.), Blade: The Series (10 p.m.)

HDNet Movies (1080i): Standing in the Shadows of Motown (6:05 & 11 p.m.), The Beach Boys: An American Family (8 & 9:30 p.m.)

Universal HD (1080i): Law & Order: SVU (7 p.m.), Meatballs, Part II (8 & 11 p.m.), Sons & Daughters (9:30, 10 & 10:30 p.m.)

HBO-HD (1080i): The Thing About My Folks (6:15 p.m.), Entourage (8 p.m.), Big Love (9 & 11 p.m.), John from Cincinnati (10 p.m.)

Showtime-HD (1080i): Jiminy Glick in Lalawood (6:15 p.m.), Mission: Impossible III (7:55 p.m.), Weeds (10 & 10:30 p.m.), Meadowlands (11 p.m.)

MAX-HD (1080i): Problem Child (6:35 p.m.), Superman Returns (8 p.m.), 16 Blocks (10:35 p.m.)

STZ HD (1080i): Flightplan (9 p.m.), Underclassman (10:45 p.m.)

Samsung's colorful line of YP-U3 DAPs now available