If you're interested in specific websites, and those websites have RSS feeds for new articles, I think you can use Calibre to automatically download those articles and format them as epub/mobi/etc. I think it can also send them wirelessly to your reader, if it has that capability.
If you like just browsing around and finding articles to read, there are services like Instaread that will also format articles for ereaders.
Basically, finding a device that will give a good browsing experience is tricky, but if you're mostly just interested in content then there are a number of ways to convert it for later reading, often automatically.
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