Jeff may feel that RSS doesn't have "a very interesting or useful future", but he is correct in saying that RSS feeds on Stack Overflow are (usually) detected by web browsers automatically. The only reason I didn't notice this before is that Firefox 4 has removed the Subscribe button from the address bar. If you're using Firefox 4 (or a more recent version), just customize your toolbar to include the Subscribe button.
You can use this for all sorts of things on Stack Overflow:
Unfortunately, not every feed is automatically detected properly. In particular, you need to manually scroll down to the bottom of the Stack Overflow home page to subscribe to the following feeds (or just use the links below).
- featured questions feedfeatured questions feed
- hot questions feedhot questions feed
- weekly questions feedweekly questions feed
- monthly questions feedmonthly questions feed
Hope this helps!