If tags and tagging are going to be independent (not that I agree with that, go comment here), tag should at least stay pointed at tags instead of tagging.
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I agree, all of them should be merged and synonyms. – Matthew Read Jun 8 '11 at 21:01
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If you see 'tag' as the verb 'to tag', rather than the noun 'a tag', you'll see 'tag' → 'tagging' actually can make sense. – badp Jun 8 '11 at 21:14