Checking Who You've Won From

I'm not actually seeing an explanation for it being down, though. :P
Well, doesn't look as though there've been any replacements for it, either. :/

That's a bit vague, but I think your latter option is the one I'm referring to, yes.
Though the functionality also included searching by user name or by game count, as well as other features.

Enter more? I hardly enter much that isn't wishlist or something and even I have more entries! Though it seems unless you are in a key group it's harder these days as anything seems to pull 1000 entries if it's public, even if it's level 3+

The numbers can change e.g. if you activate esgst for steamtrades. For me user giveaway data is option 5.11 or are you talking about a different feature?