RFC 6531 adds support for internationalized local-parts. Support in actual software may be lacking though.
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I sometimes run into sites that won't even allow a + in the name part of an email address.
And yes, I use gmail and the + functionality extensively.
In the early days I used "/" in local parts, which is syntactically valid. That turned out to be a bad idea, as some mail software was mapping local-parts to file names...