I have opened many tabs while working on project. (new feature in Xcode 4).
But for switching from one tab to other tab, the only way I\'ve found to do this is to us
XCode Windows menu option shows it as ⌘+ } or ⌘+ { but I think it is a bug since ⌘+ {/} is used for increase indent or decrease indent. The correct sequence is ⌘+ shift + } or {.