Have you considered being able to convert between an automatically-generated link/id user, and a username/password user? That way someone could potentially make a more "permanent/secure" account from the easy one. This might require removing a generated account if someone logs into an existing account from a new browser though.
I'm pretty sure at some point we'll have features which are worth protecting and at that time we'll need to offer an opt-in stronger method of account security.
EDIT: for some reason I can't reply to FreezerburnV's comment below, so I'll answer here: yes, I would be interested in talking further about this, drop me an email (in my profile)
Out of curiosity: Are you looking for any casual code contributors? The main ideas behind the site (automatic anonymous account, "slow" web kind of thing where you only see updates once a day, possibly seeing some interesting thought-provoking stuff each day) are actually pretty interesting, and I think I'd enjoy helping out with what you're working on. I have a job and my own side project(s), so I can't say I'd be really in the nitty-gritty of the project all the time, but maybe I could help out here and there.
I would understand completely if you don't want a random stranger on HN touching/seeing your code though :)
I don't see an email in your profile (by clicking on your username attached to the post). I just see submissions/comments. I can send an email to the one listed on the nightchamber about page, or you can check my profile where I just added an email address that I can be reached at. I should have put a contact email in my profile a while ago, my apologies for only having done so now.