[mistrQ]

I find that you always stumble upon fantastic articles. Recently I learnt to accept that I will never be able to read all of them and that in-fact it's better if I don't. Instead I will read what interests me at the time (while it is on the front-page of HN) and if it disappears then so be it.

Though to answer the question, anything you upvote is saved in your user profile under 'saved stories'. That's a minimalistic way to track them. Instapaper is another great alternative.

[BadassFractal]

How does Instapaper compare to something like Remember the Milk? Is it basically a to-do list for URLs?

[eykanal]

They're two completely different products. With instapaper, you visit a page, click a bookmarklet, and the page is saved to your instapaper account. You can then go back later and read the article. It's basically a huge "read later" list. There are a couple very cool features (read text-only, export to pdf|epub|other, iPad/iPod apps, ...) which really make it very good at doing what it does.

RTM is a general purpose to-do list. Theoretically, you could add a to-do with the URL and have it function as a read later list. However, the software is designed to be a to-do list, and the added functionality of instapaper will not be there, and if you ask the developers to implement, say, a preview feature for a URL they'll probably look at you funny and ignore you.