Wow I am nothing shot of stunned at this thread and how reckless the advice is in here. We as a site are great at sports info, but this one is just full of inaccuracies.
First I have a suggestion. If higher rates on a 3-year investment are an absolute LOCK, then you should be playing interest rate futures and become a billionaire. Otherwise people really ought to be questioning when you see all these people say you are sure to get better rates on a 3-year timeframe in the near future. Prime rate will be going up almost certainly, but there is no guarantee 3-year rates will follow along with it. In the meantime if you wanted to gamble on a higher rate existing in say 3 months, the market has already priced that in.
Right now 3-year t-bills are yielding 4.83%. Bankrate.com says 5-year CDs are yielding 4.62%. Here the guy says 5.6%. I am guessing he was mistaken and meant 4.6%. No legitimate bank with FDIC insurance on the full principle is going to be giving out 5.6% right now unless there is some other very lucrative business you have with them. Only way you can get a 5.6% CD with FDIC insurance right now is to have it denominated in a foreign currency. If any institution made it a practice to be this far out from the market rate banking regulators would be working on shutting them down.
In any case I want someone to find me a tax free money market account with a rate over 5%. In fact I'll make it easy, just find one over 4%. Considering you'd be lucky to get one at 3% right now you chances of doing that with a true money market fund are between slim and none. Taxable bond funds don't even pay 5% and they carry principal risk.
CDs are a decent investment if you have a specific need for the money and you need assurance of safety. If you have a kid starting college in 3 years, you don't want to be risking your principal in hopes of gaining some yield do you? I am not saying CDs are a must have in a portfolio, nor can I say this particular poster should put the money in a CD, but without knowing his financial situation and needs no one can honestly say whether it makes sense. I will say though if he truly could get 5.6% on a 3-year CD with FDIC insurance then he would have gotten the equivalent of a very strong "rogue" line in his favor.