Wikipedia shouldn't be a problem on an ereader. I can browse Wikipedia on my Kindle Touch (it even searches from within the book) and since it is a mostly-text site, with a nicely mobile-optimized site, it's quite snappy. And on that note, the 3G Kindle has unlimited access to Wikipedia in addition to the Kindle Store. (If your location has 3G coverage under Amazon's deal to begin with. They have a compatibility map, though.) But most websites will not do very well on any e-ink browser, so your mileage may vary!
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