My favorite public moblogs
http://santa.textamerica.com/
http://xmastree.textamerica.com/
http://halloween.textamerica.com/ (not working right now) 
http://camphone.textamerica.com/
http://sushi.textamerica.com/
http://bath.textamerica.com/
http://fire.textamerica.com/
http://thebird.textamerica.com/
http://drive-thru.textamerica.com/
http://weather.textamerica.com/
http://numbers.textamerica.com/
http://mydesk.textamerica.com/
http://christmas.textamerica.com/ (I don’t think this is a public one.)
UPDATE: More public moblogs:
http://yourart.textamerica.com/
http://dogblog.textamerica.com/