A bunch of journalists and other mainstream media types are getting what Scott Greenfield as described as "butthurt" over people recycling their writing to drive blog traffic, and in some instances divert traffic away from the original source. One proposed solution to all this is to create a unified system of symbols to indicate where material is originally coming from called The Curator's Code. Here's a look:
These two symbols don't really capture all of what bloggers do when referencing source material though, so here's a few more that might help:
If you cannot use these symbols due to lack of time, lack of inclination, or lack of tolerance for idiotic bullshit (fu Curator's Code), feel free to use the text alternatives: "via" and "h/t"