You could make it so you have to have your blog in your HN profile and have a karma of at least $x to reduce spam.

>There's a cronjob checking the thread every 12 hours but I will eventually shut that down and it will become static after that.

Which post-ex-facto? You should still be able to add your blog to the original submission.

Same, I think this is a great idea and would like to submit mine as well -- maybe an "add" feature on the page would make sense, or re-inquire here at intervals, maybe monthly/yearly?

I commented, but mine got missed, somehow. Maybe because my phone auto-capitalized the "H" in "http" and the script didn't account for funny capitalization. Sad!