MindMapping
iThoughts. Download for $16.99 for iOS. A list of tutorials here.
MindNode. Download for $13.99 for iOS. A tutorial here.
Scanning
Cam Scanner. Scan docs into clear & sharp image/PDF, to email, fax, print or save to cloud. Free download for iOS and Andriod.
JotNot Scanner. The original iPhone and iPad scanner app. $6.99 download for iOS.
Voice Dictation
Dragon Mobile Assistant. Brings hands-free text messaging and more. Free download for Andriod. A demo video here.