Yeah, not all sites have an rss feed or it's hard to find. Here is a few tips:

• 1/Share the url with your rss reader, the reader can search for you. This doesn't always work.
• 2/Add one of these to the site's url /rss .rss /feed
• 3/If step 2 doesn't work look for a "blog" or "news" tab and try steps 1 and 2 there.
• 4 When all else fails ask for feeds, making sure to state the topics you are interested in.

i get mine from Ars, The Register, The Verge, NPR, and Computerworld so far.

If you're asking what I think you are, I get mine by searching "best RSS feeds" and then manually looking through the list. Then, if I ever find myself going to a site a lot, I'll see if they have one or if someone has created an RSS for it.

Every time I visited a site with interesting content I looked for the rss symbol. Often times I'll just add .rss or /feed to the site's URL. Sharing the URL with Feeder often works.

I have all feeds in a note encase someone asks for them. Happy to post.