Watching the log, though, I find one thing interesting:
[19/Oct/2007:12:12:37 -0700] "GET /wp-content/themes/pyilewptheme/iphone.css HTTP/1.1" 200 355 "http://pyile.com/2007/10/i-want-my-%e2%86%a9/" "Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/419.3 (KHTML, like Gecko) Safari/419.3"
[19/Oct/2007:12:12:37 -0700] "GET /wp-content/themes/pyilewptheme/iphone.css HTTP/1.1" 200 354 "http://pyile.com/2007/10/i-want-my-%E2%86%A9/" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:126.96.36.199) Gecko/20070718 Firefox/188.8.131.52"
It looks like Safari and Firefox encode the ↩ differently in URLs. I’m not sure which, if either, is “wrong ((I’m sure it’s in the HTTP spec, but I can’t be bothered looking it up right now.)),” but I found this interesting. When I was testing the ↩ in the URL, I only checked that it worked in Firefox and Safari. I didn’t think to check that they requested it the same way. I imagine Apache is doing the conversion here, but would other web servers do it as well?