I use a plain old Polaris browser on a BREW OS (LG Env Touch).

I do appreciate all that I can accomplish with m.rememberthemilk.com (even though I would like to see more operations accessible directly from the individual task page, and really want way to postpone, complete, or delete multiple tasks at once ;)

However, in order to save time, I have a mailbox set up in the phone's mobile email app with messages that contain direct links to specific operations on the mobile site.

Message 1 – Portal:

Login
https://m.rememberthemilk.com/

Add
https://m.rememberthemilk.com/add

Search
https://m.rememberthemilk.com/search

Today
https://m.rememberthemilk.com/today

Tomorrow
https://m.rememberthemilk.com/tomorrow

This Week
https://m.rememberthemilk.com/week

Message 2 – Lists:

(contains a link to each list and smartlist)

Message 3 – Tags:

(contains a link to each tag)

It's a lot faster navigating one page of all tags in mobile email than it is clicking through page after page of 7 or 8 tag links at a time. The downside is that I have to update the messages when I change lists or tags on the web.