I have one. It buzzes with email from time to time and I salivate. Call me Pavlov. Woof.

I find the builtin "lists" function to be marginal for doing searches, but I've accomodated myself to it at least to use it as a very simple capture device. I preface each list entry by the date (e.g. 11 01 put pumpkin on compost pile). This lets me quickly see how the todos are piling up.

For my weekly review (ha) I go through the todos and purge out any that don't belong on the phone, copying them into my one big text file.

This system has only been evolving for a little while so I am willing to believe it could be better, but it is nice to have a thought fly past and be able to catch it on my phone. I like that. With a better search for the todo list it would be better, but I guess I'm spoiled by grep.