Read it Later is a convenient Firefox extension that enables you save links to interesting websites that you have come across, without littering your bookmarks with nonessential items. The software offers two new toolbar buttons and a right-click option to your Firefox toolbar, which can be used to quickly add the current page or link to your Read it Later collection and to browse your saved page links. Your Read it Later items are stored in a designated bookmark folder so they are kept separate from your regular bookmarks. In addition to the bookmark features, the software also integrates with a wide variety of social networking sites and allows you to share interesting content with your online communities.

If you have a individuated homepage (i.e. Pageflakes or iGoogle) or frequent news sites like (i.e. Digg or CNN), you can quickly scan all of the headlines on the site, saving all links of interest by using the Click to Save mode and saving to your list. When you are done, just start going through your list, uninterrupted. Beats having to go back and forth though-out the site!

Excluding this plugin, I see two options for creating a list of pages you want to read:
The Old Way:
* You can log the URLs by emailing yourself or writing them in a text file. This is cumbersome and hard to move through or find.
* Bookmark the site in a special tag or folder of 'To-Read-Later'. This works well for keeping your links in a single source, but it is a pain to go in and remove or re-categorize each page after you read it. Also, if you use an online bookmarking service, it means you'll have to login in and go through a few clicks before getting to your list.

The above methods are honestly, just workarounds to what should be a simple task. The Read it Later extension is meant to provide an easier solution.
The New Way:
* When you come across something you want to read later, simply click the 'Read Later' button and the page is instantly inserted into your reading list.
* Then when you have some free time, just click 'Reading List' and it'll pull up something for you to read.
* When you are finished, click Mark it As Read and it will be removed from your list.

If you found what you read to be worth bookmarking, you can use the dropdown under Mark it As Read to add it to your Firefox bookmarks or any online bookmark service such as Del.icio.us.

The license of this software is Freeware, you can free download and free use this browser plug-ins software.