Drop your 60p clip in a 24p sequence. Right-click the clip, and select Frame Blend. That's about as good as you'll get in Premiere Pro.
If you need 24p, why not shoot in 1080p? The T3i provides for 23.976 (24p) in 1920x1080p mode. You can always scale the 1080p clip down to to 720p.
Thanks for the help!
The times I'm shooting in just 60fps are usually when filming at nightclubs/concerts, since I want to be able to slow down any footage if need be.
When you say that's about as good as I'll get in Premiere Pro, is that to say there is a plugin or alternate program I can use to conform the footage better?
After Effects would probably do a better job, since its frame interpolation algorithms are capable of smoother results, at the expense of greater processing time. It's a similar process there--drop the 60p clip in a 24p comp, and enable Frame Blending for the footage item and comp. Frame Mix is approximately what Premiere Pro does, but Pixel Motion is more sophisticated: Adobe After Effects CS5 & CS5.5 * Frame blending
There's also the Time Warp plug-in in AE, as well as third-party plugs like Twixtor.
Okay, that's good to know.
While the topic is brought up, is the Time Warp plug-in in AE comparable or on par with Twixtor? Could I just use that or should I get twixtor if I'm going to be doing serious slow-mo?
I also wouldn't mind knowing if there's a similar Twixtor option. While Twixtor seems to work pretty darn cool, I can't find myself spending $300+ on it...