When I owned an iPhone I used an app called uPackingList. It had a great user interface. When I bought my Android I couldn't find an app which I liked as much as that, but of the 3 or 4 which I tried, Packing List was the best. I have just looked in the market and uPacking list is now available for Android. I have no connection to this app but I've installed it and it looks just as good as their iphone app. I'll be converting right over to uPackingList again.
I just finished building a packing list app for Android called PackPoint. I'd be curious to know your thoughts on it, like whether you think it is truly useful for your travel needs. It is on Google Play.