When Xcode autocompletes an method for me, it gives me blue blocks for parameters. I always go into the first, but then I click into all next ones rather than fast going there by keyboard commands. I guess that there are some good ones to know.
The default is Command-/, but you can customize that in the key bindings section of XCode's settings window.
In Xcode 3.2 (Snow Leopard), you can also use the Tab key to navigate between parameters. Personally, I find this more intuitive than Command-/.
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