Nope. Just work in a 23.976 timeline.
You *might* notice some issues in transitions, and if you do, conform the 29.97 to 23.976 first, then edit. If you're in Vegas 4/5, you'll probably need to do this, but if you're in Vegas 6, you shouldn't have to.
You have lots of output options with 23.976 (24p)
DVDs created at 24p use nearly 25% less disc space. It's easier to take 60i to 24p than going the other way for output depending on workflow, but your bigger question should be...If I have 100 clips of 60i and 1 clip of 24p, should I be working 60i or 24p timeline?
Take all that into consideration. Output is easy, regardless of framerate. 60i/50i are pretty easy to convert to 24p and get a quality output. Going the other way can get squirrely in post sometimes.