PhoneFavs just launched what they're claiming to be the first social bookmarking system completely designed and optimized for mobile phone users:

"The free service enables users to keep an always-available list of bookmarks for web sites that can be easily viewed on a mobile browser."

In other words, it's del.icio.us for cell phones. PhoneFavs' home page serves as a gateway to its three main services: online bookmarks or Favs, a handpicked mobile link directory, and a "mobilizer" which automatically adapts standard web pages for improved viewing on smaller screen devices.

Or you could just download Opera Mini 4, which this author reviewed and liked a lot.

PhoneFavs Debuts as First Social Bookmarking System Optimized for Mobile Phone Users [PhoneFavs]