jquery javascript design: self executing duty vigilant literal?

i'm extraordinary there any best practices relating jquery constructing encapsulated formula blocks.

generally, i make page i encapsulate functions used within page inside an object. allows me encapsulation building applications. there's zero i loathing some-more observant javascript record garland this

function dosomethingonlyrelevantonthispage() {
    // stuff
}

i creates unfinished design, doesn't unequivocally encapsulate functionality nicely.

commonly frameworks, there customary used perform encapsulation.

in mootools preference vigilant verbatim notation:

var site = {        
    // properties methods
}

in yui preference self executing duty notation:

(function() { // properties methods })()

the good thing second instance closure created, so permitting interpretation private properties methods.

my doubt this: any jquery aficionados have any best practices formulating purify encapsulated structures? martial behind use?