I would never condone stealing content from other sites (scraping or otherwise) but there is a way you can do this that will possibly avoid dup. content penalties, DMCA complaints and not steal (at least not completely steal).
If you are using RSS feeds from other sites, then you can pull a section of an article and put a full linkback a the end of the post. Obviously, you'd need some custom code to grab the first 200-250 words neatly and then post a "For the full article go here"-type link.
This could also include using Feedspinners as Chio suggested.
There are some advantages to doing it this way and of course, what blogger would complain about a free link back? Depending on who you ask, the OBLs won't necessarily hurt your rankings and may improve them - assuming quality of blogs you get your feeds from and relevancy.
Anyhow, just an AM thought
