I also have an issue with MultiBit on the Mac. I sent a small amount from one wallet to another with a fee and it still hasn't been confirmed 24 hours later. In fact, it shows up on blockchain.info:
http://blockchain.info/tx-index/4e5da946e3d87c57c7c89f42b25bda54fcee9c497a8941e42c7836b56a4b3cc5But it gives me a "no such transaction" error page on blockexplorer.com: http://blockexplorer.com/tx/4e5da946e3d87c57c7c89f42b25bda54fcee9c497a8941e42c7836b56a4b3cc5
It was seen by 4 peers. It's certainly taking its sweet time to confirm... How long before I should be worried?
You only included a fee of 0.0001 BTC. The "standard" fee for that transaction would be 0.0002 BTC. The typical fee would be 0.001 BTC.
As such, it will probably take a really long time for it to confirm. It could take a few days. If it hasn't confirmed after 2 weeks, I'd be concerned.