Everybody seems to be commenting about the advogato diaries, so now might be a good time to share my thoughts about them.
What makes the diaries here on advogato so interesting is that so many people keep their diaries in one place. Before advogato, there were already some hacker diaries, the best known ones are probably Alan's and Miguel's, but they were kept separately. Here, people read each other's entries and comment on them in their own entries.
I think it would be nice if it were possible to directly refer to one specific diary entry of another person, so that it I wanted to point out that Ankh's diary entry was really ugly, I could refer to that so that it's clear which one I'm referring to (At the moment it's very clear which the ugly one is, I think).
This one would be relatively simple to implement, I guess. If the entries are numbered, you could just use a url like "/person/name/diary/123".
Furthermore, it would be cool if such references were also visible the other way round. That is, if I were to put a comment about one of raph's entries into one of mine, there would be a link under raphs entry pointing back to mine. This would be a good way to find out what other people think about an entry, and whether anybody comments on your own one.
For a start, it would perhaps be enough to scan diary entries for links to other entries when an entry is added or modified and use that information to generate the links under the referenced entries.
Perhaps I should also have a look at mod_virgule...