I am always on the lookout for well designed mobile webpages and quite a few have cropped up over the past few years. Here is my collection that I use with Opera Mini 6.5 (Symbian) and I will add to this list as I discover more great sites. And please add your own 
Tech/Science
Ars Technica
http://arstechnica.com
Discover Magazine
http://m.discovermagazine.com
Engadget.com
http://m.engadget.com
Gizmodo
http://m.gizmodo.com
io9.com
http://m.io9.com
Popular Science
http://m.popsci.com
Physorg.com
http://pda.physorg.com
TechCrunch
http://m.techcrunch.com
The Verge
http://mobile.theverge.com
Wired.com
http://m.wired.com
News
News24.com
http://m.news24.com
Mail and Guardian SA
http://m.mg.co.za
Timeslive
http://m.timeslive.co.za
BBC
http://m.bbc.co.uk/news
CNN.com
http://m.cnn.com
Weather
Foreca.com
http://m.foreca.com
Weather Underground
http://m.wund.com/ - General mobile
http://i.wund.com/ - Touch optimised
http://www.wund.com/ - Light
Social
Twitter
http://mobile.twitter.com
Facebook
http://m.facebook.com/ - General mobile
http://touch.facebook.com/ - Touch optimised
Time wasters
theChive.com
http://m.thechive.com
9gag.com
http://m.9gag.com
Tech/Science
Ars Technica
http://arstechnica.com
Discover Magazine
http://m.discovermagazine.com
Engadget.com
http://m.engadget.com
Gizmodo
http://m.gizmodo.com
io9.com
http://m.io9.com
Popular Science
http://m.popsci.com
Physorg.com
http://pda.physorg.com
TechCrunch
http://m.techcrunch.com
The Verge
http://mobile.theverge.com
Wired.com
http://m.wired.com
News
News24.com
http://m.news24.com
Mail and Guardian SA
http://m.mg.co.za
Timeslive
http://m.timeslive.co.za
BBC
http://m.bbc.co.uk/news
CNN.com
http://m.cnn.com
Weather
Foreca.com
http://m.foreca.com
Weather Underground
http://m.wund.com/ - General mobile
http://i.wund.com/ - Touch optimised
http://www.wund.com/ - Light
Social
http://mobile.twitter.com
http://m.facebook.com/ - General mobile
http://touch.facebook.com/ - Touch optimised
Time wasters
theChive.com
http://m.thechive.com
9gag.com
http://m.9gag.com
Last edited: