Primetime Preview: 90210, NCIS, McCain vs. Obama

What should you set your TiVo for tonight? And what should you say Ti-NO to?

Our staff combs through this evening's television listings and helps readers set their viewing schedules:

• 8 p.m. A brand new 90210 promises semi-entertaining twists and turns (The CW); Will anyone be voted off Dancing with the Stars? (ABC); NCIS (CBS)
• 9 p.m. The Presidential Debate (every network); McCain and Obama, who? Bravo premieres Real Housewives of Atlanta (Bravo)

Naomi Clark is rarely up to any good on 90210.

Avoid at all costs: Biggest Redneck Wedding Ever (10 p.m. on CMT). Need we really explain why?