<rant>
I am not a guy who regularly checks if there any changes to specs, infact I cant remember the RSS spec at this very moment, so the content of this post could be 90% BS, 10% my the things I want.
To state the obvious there are a lot of interesting blogs out there. And some of them (really good ones at that) might not be in English.
Take Micheal Greth for example. He really blogs some awesome stuff or so I am told. But subscribing to his RSS feed really gives me nothing. What I would really like to see is auto-translators for this kind of content (i.e. the feed). Either in the aggregator or through some external service.
True web-language translation is far from accurate, but something is better than nothing.
What would be really cool to see if the RSS Spec can accomodate for default feed language (it already does IIRC channel language or something like that), and Feed Item language if it something thats not the default (i.e. to accomodate bloggers who blog in different languages, yes the blog engines might have to support this as well). Thereby Aggregators or an RSS Translation Proxy could be smart enough to only translate items that is different from your default language.
</rant>