Hold For Developer Release

When creating a new version of an app there is an option to release the app after it's approved or hold it for the developer to release. I'm not aware of a way to modify this setting after the version has been created, so it's probably a good idea to always choose hold for developer release. Apps being submitted for the first time do not have this option and the work around appears to be to set the apps availability date to some time in the future in Rights And Pricing.

Update: Confirmed that setting availability date on a new app will hold it from the store release. The gotcha is the app position in iTunes "New" list appears to be based on approval date, so the longer you wait the less time your app shows in "New".

Browser Usage Stats

Global stats from W3C (browser, OS, screen resolution)

but the US has a heavier IE proportion:

US browser stats