Star charts

I'm not a big fun of using paper star charts of any kind. They are bulky, prone to damage in the field, require light source, and there are too many of them necessary to cover all my interests for a single night. Instead of paper I'm using the Astromist hanheld planetarium software. At the moment - on my Windows Mobile 6.5 phone, and on my old but still functional Palm OS PDA - in the past (by the way, there are iPhone and iPad versions of Astromist are available from the same developer, but nothing comparable for Android or Windows Phone 7 yet - very sad). Astromist is the best pocket star atlas and observations planning software available for amateur astronomers of the planet Earth, period. Highly recommended!

EDIT: So, by now (2016) I've made one for Android myself with a friend. See DSO Planner - the best handheld digital star chart ever built!