Just interested in what apps you are always using. For me in no particular order (iPhone) - RunKeeper, Safari, Mail, Twitter, Audible, TuneIn, Instagram...
Apart from the usual suspects (Phone, Message, Mail, Safari): Whatsapp, WeekCal (Great calender replacement), Plaintext (Great notes replacement +dropbox sync), Dropbox, Alarmed (Great alarm + reminder app), Navigon plus the latest casual game I run (currently Modern Combat 3 (which still amazes me running it on a 3GS)).
The ones I use the most are RunKeeper, SleepCycle, iReal b (great tool for practicing jazz), plus Yahoo Japan's app for looking up train routes.<p>I also often use Skype on my phone because it sucks less than on my Linux desktop.
These are the ones I use most: <a href="https://www.dropbox.com/sh/5rryu7904o9xku3/KcEycVRsxq" rel="nofollow">https://www.dropbox.com/sh/5rryu7904o9xku3/KcEycVRsxq</a><p>[update] - not sure why there is two Mobile Mouse =p
iphone: mail, calendar, phone (obvious) DO (tasks) Openera (files/attachments), Evernote (notes) Tweetbot (twitter) Google Maps...oh wait... not anymore.