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Merina IUD
Placed in the uterus(vaginally) by the OB, 99.9% effective in preventing pregnancy. Minimal side effects, periods may eventually stop, lasts 5 years and can be removed at any time if she wants to get pregnant.
Here is the site. Would highly recommend.
http://www.mirena-us.com/howmirenaworks.html
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According to that site, Merina should only be used by women who've already had a child, although they don't explain why. That seems like a pretty significant drawback. Any idea why they say that?