Also be sure to submit it to bugzilla so it might be in official portage some day:
http://www.gentoo.org/doc/en/ebuild-submit.xml
Of course, it would make sense to look in the bugzilla before you even write the ebuild (or install it by hand) - a lot of the time, some other kind person has already done the work for you and posted an ebuild :)
Daniel
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