Well, according to widget : widget's Terms and Conditions page, their icons are all available under Creative Commons noncommercial and/or commercial licenses.
Icons with the noncommercial license are free for noncommercial use, including noncommercial websites. I believe this would qualify as a noncommercial website.

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No doubt about that.

According to the badge on their icon archive page, but the Magnum Opus set is non-commercial-only. Which means we're free to use it on here, as long as we give them proper credit, aren't charging any money anywhere, and don't modify the icons.

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Argh, Now I wish I still had an Account - I had Magnum Opus for a while but as it was in OS X icon format and not png, I couldn't get it off my drive conventionally and didn't know about doubling and the like at the time...

But yeah, I'm all in favour of using Magnum Opus as the icon set for old hardware, it's more comprehensive and better quality than the IF stuff, and available in 128*128 (good for icons in specs pages) and 32*32 (good for userboxes) at least