I guess this might be a bit US-based?
I've been considering what to do with the money I'm setting aside for my quarterly self-employment taxes.
My initial thought is to toss it into a high-yield savings account so that it can make the LLC a few bucks while it's sitting around for the year.
What does everyone else do?
You should discuss this with a CPA. Accumulate all of your questions, schedule an hour, email them in advance, go in person to get them answered and discuss.