I know a lot of our users don't use RSS feed readers. Every day I look at our statistics and I can see the huge difference between subscribers, page views and a RSS feeds pulls.
One of the factors is that RSS feeds require yet another program - and most users are not comfortable installing new programs, or sometimes don't have access to downloads or simply prefer not to install unknow programs (although some are quite famous these days).
For these folks there are a couple of solutions. Newsgator offers a free web-based feed reader service. For a small fee you can even have multiple versions of your favourite feeds, formatted for different devices and locations.
Another option, for email lovers is a new free service from FeedBlitz. After you register (free) to the service, a daily digest will be sent to your email address, with all new entries posted on Geekzone on that day.