The best way to get in contact with me is through Twitter or email.
Email: rwhitwam (at) gmail (dot) com
This address is mainly for communicating with potential clients, but you can send me a personal message if you'd like me to cover something specific that is within my field. Please do not add me to your generic PR database. I do not read these emails.
If you have an app for me to look at, please link to it in the Play Store or provide an APK. I cannot promise I will be able to cover all your projects, but I do offer consulting services. Contact me for more information.