Here are two bookmarklets I use every day. (Bookmarklets, you ask? What are they? More here.)
The beautiful thing about bookmarklets is they should work from within IE, Firefox, Safari, or any web browser that lets you put a bookmark in its Links bar.
Because I read lots of articles and blogs online, I click the Readability bookmarklet a lot. (In fact, it's the rightmost link on my Links bar in both my work and home browsers.) Lifehacker has a good mini-explanation with video of what it does, but essentially the Readability bookmarklet strips out all the page and font formatting and presents just the text, sans background, affiliate links, banner ads, etc. Select the settings you want on the Readability site, drag the bookmarklet to your Links bar, and away you go. As Lifehacker notes, it's not perfect, but it gets the formatting right for me about 98% of the time.
Yes, some web sites like NY Times or New Yorker have printer-friendly pages, but they're not always reader-friendly pages. With the Readability-formatted page in the browser, I can quickly read a narrower column of text on a gray background, which my eyes find more restful than glaring white.
I can also print the reformatted page, which looks great, or save it to PDF. I generally prefer the Readability version over any web site's printer-friendly version.
I also like using the Readability bookmarklet with my toread bookmarklet. The toread.cc site bills itself as an "email-based free bookmark service." Which is accurate but sounds klunky. Delicious, which I use heavily, is also a free bookmark service. (I don't use browser bookmarks anymore; it feels so '90s.) But Delicious doesn't let me search the contents of the pages I've saved, so I should make good notes or provide good tags that will enable me to find the link again later.
What I use toread.cc for is as a way to archive web-page receipts, web pages with information I may want to access again someday, or web pages I may want to read later. When I'm on a page that has text I want to keep, I click the toread bookmarklet, and the entire page is emailed to my Gmail account. (I specified my Gmail address when I signed up for the service.)
Because I use Gmail, I can now search the full text of these saved pages and generally find what I want pretty quickly--which is the chief advantage of using this method over Delicious. Using toread is a way to build up a personal web archive in a painless fashion.
I don't store everything I read online using toread and Gmail, only stuff that I think I'd like to hold on to "just in case" (which is the clutterer's curse). If I'm doing lots of web-based research on a topic, then I'll use Delicious to group a large number of sites under a single tag and harvest the sites later. More likely, if I read a poem from Poetry Daily or an essay I particularly like or a computer tip I want to have on hand, then I'll use toread.
When used with Readability, the toread service helps me to archive clean-looking pages that don't have billboard/classified-ad clutter that permeates web and blog design these days. (And my toread bookmarklet is on the leftmost side of my Links bar, so I don't accidentally click it when I really want to click the Readability bookmarklet.) (Do I like to complicate my life with these rules, or what?)
I don't trust that pictures or graphics are saved via toread; I think they're included as links in the email. If the original site goes down, then it would take the graphics or pictures with it. So I tend to focus on text-based material.
Incidentally, I sometimes find that when I go back to read pages I emailed to myself, I've sometimes lost interest in them and wondered why I thought I wanted to read them. These tend to be deep-dish think-pieces from Arts & Letters Daily. So, using toread provides cooling-off time between "Ooh! New thing! Must read! Must distract myself!" and "Hmpf. Why did I save that?"
Another reasonable objection to using toread could be, "Aren't you just junking up your Gmail?" Maybe. I have a filter that labels every email from toread.cc as "Later." So, yes, there are many to-be-read emails in the "Later" bin, but they can be filtered out of searches or I can search only within the "Later" bin; both options allow me to narrow my focus as needed.
I also feel that, geez, don't we already know how to delete, sort, or file emails? Could it be any easier? Try sorting and deleting Delicious bookmarks; it's better these days but not as easy as email. Email, for better or worse, is the world's most oft-used app (no matter the application nor whether it's web-based or computer-based) that, presumably, most people already know how to use. Why not push the stuff I want to read or do through my email application? It prevents me from having to learn a new application and, filing-wise, I now have one place to search for that needle in the haystack, instead of several different services (or the whole web, for that matter).
Note: I see that toread also offers a service called news.toread.cc, that uses data collected from the toread.cc service to show what people are bookmarking. It's rather like Delicious's home page showing what people are bookmarking. Just pointing this out if security is an issue.