I spent a lot of time trying to find the answer to this question (I need Android to see StartSSL certificates). Conclusion: Android 2.1 and 2.2 allow you to import certificates, but only for use with WiFi and VPN. There is no user interface for updating the list of trusted root certificates, but there is discussion about adding this feature. It is unclear whether there is a reliable workaround for manually updating and replacing the cacerts.bks file.
Details and links: http://www.mcbsys.com/techblog/2010/12/android-certificates/ . In this article, see the Link to Android error 11231 - you can add your vote and request for this error.
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