3. The old del.icio.us used to have global bookmarks for a tag at /tag/tag1, and user's tags at /user/user1/tag/tag1, with ways to easily jump around between the two. I always thought that was really nice.
Oh yeah, that was a slip. I've clearly spent more time posting links on Lobsters than HN recently. Yeah, Markdown or a HTML subset would be nice. Embedding the links is an advantage Lobsters has over HN since it reduces clutter.