I watched SciFi's rendition of Riverworld last night. I kinda liked it, but then I never read the books. I thought it was going to be a miniseries, but apparently it was a pilot for a regular series.
The reviews of it from people who have read the books regularly put it into the "sucked" or "awful" category. At the very least, it has inspired me to go out and by the first book, which I imagine will be quite a bit better.