An assortment of great tips, neatly organised into sensible categories...
This page will be regularly updated with new additions from the main blog page.
General
What is Titanium?Titanium Studio Overview
App Setup
Tab Bar IconsCreating Universal Apps that work on both iPhone and iPad
Cleaning the Build Folder
Dimensions and Sizing
iPhone Portrait
iPhone Landscape
iPad Portrait
iPad Landscape
Media
Embedding YouTube videos [Codeboxed.com]
Using the music player [Clearly Innovative Thoughts]
Maps and Directions
Distance between 2 points [Clearly Innovative Thoughts]
Fixes
Invalid Binary (Push Notifications Issue)Ti.API.info not working [Appcelerator Q&A thread]
Getting your app on the App Store
How to remove status bars from app screenshotsAd-Hoc testing [Codeboxed.com]
Advanced Topics
Installing an add-on moduleTesting an add-on module
Bonjour networking tutorial [CssGallery.info]
Titanium API
Official Appcelerator API documentationReal-time searchable Titanium API documentation [Tidocs.com]
Titanium API Dashboard widget for Mac [Lemonadestand.com.au]
Titanium API Browser application for iPhone, Android, Mac, Windows & Linux [Codeboxed.com]
Extensive Tutorials
7 Days with Titanium [CssGallery.info]Database Driven Tables with SQLite [Mobile Tuts+]
Build a Pizza Ordering app [Mobile Tuts+]
Build a Stock Quote app [Mobile Tuts+]
User Authentication [Mobile Tuts+]