I have used it for years too and swear by it. I used it for the few weeks leading up to my wedding and it was just so fantastic and kept me really calm. I have been taking it each morning for the last couple of weeks - just to help with the impending panic of upcoming birth and have to say I generally feel pretty calm each day at the moment. I fully intend to use it during labour too.

I've been a fan of Rescue Remedy for years -- I've been using it since I was at uni and needed to calm down before a big exam. It's made from flower essences and is harmless to children and even pets (I have given it to my dog in his water bowl). You either put a few drops on your tongue, or in a glass of water, or you can get the new pastilles (wee gelatine drops) that some pharmacies are carrying. It is great for stressful situations or when you're suddenly caught up in an emotional issue. I've used it for myself when I'm in a hurry and get stuck in a long queue, or have to deal with the customer service people at my internet provider, or when I am at the supermarket and Em is screaming her head off while I'm trying to finish the shopping. I've given it to Em when she gets overtired -- it doesn't help her sleep, it just calms her down and helps her to relax into being tired so she can go to sleep. It's fabulous!

Here's the info on it from the original manufacturer (Bach):

http://www.bachflower.com/Rescue_Remedy.htm

It's a little pricey but as you only use four drops at a time, it's worth it. I've got a pack of the pastilles in my handbag -- from memory it cost about $10 and it's lasted me about 5 months (and I've got enough left for another month or so).