There's been a bit of chatter about these in the birth control thread, so I thought it deserved its own topic! (Also, I love menstrual cups and think they always deserve their own topic.) Here's the basics: there's one disposable brand, Insteads, and a whole bunch of resuables: DivaCup (Canada), Mooncup UK, Keeper and Moon Cup by Keeper (US), Lunette (Finland), MiaCup, Femmecup, and Lady Cup. I'm pretty much going to talk about the reusables here because I know very little about the disposables. Most of them are available online and at least some are available in stores--the Diva and Keeper brand ones in the US and Canada and the Mooncup in the UK. All but the Keeper (which is latex) are made of medical grade silicone, I believe. The Livejournal community is a wealth of information: http://community.livejournal.com/menstrual_cups/
I love my DivaCup. I've been using it for about two and a half years and it is the best thing to happen to my period, including birth control pills. While cups are tricky to get the hang of, once you know how to use it, it's easy, simple, and comfortable. I often forget mine is in. And with my fairly light period, I only have to empty it once a day, and I can do it in the shower. They hold more than tampons and aren't dry like tampons can be if they're not fully saturated. They also have less of a risk of causing TSS, since they are made of sterile material and don't scratch you. Plus, there's almost no waste, so they're way better for the environment.
Anyone else here use menstrual cups? Anyone considering it?