www.mobipocket.com (download the free Mobipocket Reader (and free ebooks) to your PC, then your eBook Reader will be recognised when its connected to your PC. You can synch files using it. Its not essential, as your eBook Reader will be recognised by your PC as an external hard disk - like a USB stick - but its a nice program for managing Mobipocket books and RSS feeds.) Click on "eNews Store" on the left to search for free RSS feeds. and "Add eNews" to add your own RSS feeds to Mobipocket.
www.feedbooks.com (for your ECO Reader or Cybook: select Cybook or Kindle Mobipocket or PDF format. For your iLiad or DR1000S, select iLiad format and either Mobipocket or PDF format. These will display beautifully on your eBook Reader)