Two thoughts on this.

I personally use Instapaper for marking sites to read later. It both grabs the link and a rendering of the page which can be viewed later by logging into Instapaper.com, or from Kindle, iPad, or iPhone. Extremely handy. I sync it to an iPad and read them offline later.

If you’d rather the links be in Nozbe, use the Add Action to Nozbe bookmarklet. Just copy the link, click the Add action to Nozbe bookmarklet, type in a note about the site and paste in the link. Done.

I like the idea as nozbe can use the favicons to represent each site as well and also suggest we go to x site and even have a drop down in the browser that shows us the project or task associated with it.

I use the Evernote clip extension for Google Chrome and then, of course, link Evernote to Nozbe.

I should have mentioned Evernote as well. For me the difference between Instapaper and Evernote is that Instapaper is for stuff to read and then likely be done with, Evernote is for things I want to keep and reference after I am done reading it.

I use Readitlater for reading web pages later. They also have a Iphone/IPad, Android, Blackberry App. When I want to ‘keep’ the content, I clip it to Evernote.
What Delphina mentions sounds pretty reasonable too, if you want to keep everything in Nozbe.