Development is mainly coordinated via IRC and the mailing list. Be sure to visit both once in a while if you do not want to miss critical stuff.
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[email protected]: List for comments, criticisms and everything development related.
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[email protected]: List for commits to the Git repository, mainly useful for people working directly with the source.
If you want slightly faster, live answers to your questions, you are free to join our IRC channel #supertux, hosted on chat.freenode.net. If no one answers, please don't just leave but try to wait for someone to read your questions. Do note that by joining, you agree that everything you say is logged publicly here. If you don't have an IRC client installed, you can also use freenode's webchat.