Google Reader is good to leverage for this purpose. For example:
You can use the browser to read your Google Reader feeds directly with '
G:RSS-Web'. It works pretty well, given the limitations of the browser (can't open a new browser window).
One of the calibre recipes is for Google Reader as well if you prefer to do your reading off line, but of course that would have to be done over your dialup line (but you could schedule it to happen while you do something else).
And I believe there's a hack for the browser issue (see Kindle Developer threads), but I haven't had a chance to try it yet.