I'm thinking of making some of the content on my site available by an RSS feed. Are there any significant disadvantages to using version 2.0, as opposed to 1.0 or 0.92? Are most/all feed readers now capable of reading version 2.0? Conversely, does version 2.0 offer any advantages (in terms of available data items, maybe?) over older versions?
The short answer is: I am not aware of any RSS aggregator that does not support all formats. So pick the one that you find easiest to use that does everything you want it to do. If 0.91 does that for you, go ahead and use it. If 2.0 works for you, use that.