This is an interesting post about increasing blog readership through RSS and email subscriptions. One tip: “Popular bloggers will all say that to build a large dedicated following you must keep a blog that is consistently on topic and make it as easy for your visitors to subscribe.”
Another tip that is repeated in the post, and in the posts linked to is prominence of “subscribe” buttons, both for RSS and for email subscriptions.
One point I may be too tech savvy to confirm or appreciate is that many web users and blog readers are not totally comfortable with RSS. I would think that with Google and Yahoo both including RSS Reader functionality alongside their webmail functionality that many readers of blogs are familiar with and comfortable with RSS.