Rubric seems to do everything it says it will do: it stores notes and bookmarks, and its interface has no big glaring bugs.
There are some things I'd like to do, but I'm not in a big hurry; they're all gravy, as Rubric already does everything I need.
Useful titles and headers. Turning a set of Entry::Query parameters into English would be a good first step.
Sync with other Rubrics, probably using something like Class::DBI::GUID.
WWW::Rubric, like Net::Delicious. Once either this or the previous is done, it will be easier for people who aren't me to use something like Vim to make todo's. Their script can either post via the web, or to their local Rubric, which can be synced later.
A new default style and templates. I'm OK with what I have. It's obvious and simple. Joshua from delicious would like us to look less like delicious, and I'm not opposed to the idea, especially if someone else wants to do the work and give it to me.
Other ways to add unique anchors to entries. Right now, the only possible kind is URIs. It'd be nice to be able to use something else, or to have multiple possible kinds that can be disambiguated.
Overcanonicalization of certain URIs. For example, Amazon URIs should be stripped down to drop their session info.
Private notes. Maybe. A way to say, "Everyone can see my entries, but not this entry." This might be the first "magic tag" setup, where tags beginning with some magic character (dot? colon? tilde?) will be reserved for magic uses.