Removing sticky residue (tape, stickers, labels etc)  

It depends on the surface...
It depends on the surface and what is to be removed..yall seem to want to use uber caustic solvents...try really warm water first...the lighter fluid can really F stuff up...I have seen some really bizzare reactions on various plastics...

Always try
solvents on a hidden surface first !
You can't really expect water alone to have an effect on petroleum-based substances. . .

Whitespike sweat is only...
Whitespike sweat is only usable on orange surfaces.

Tape
I've had quite a bit of luck removing some adhesives by using...another adhesive.
Get a good-quality masking tape with plenty of "stick" to it, and "dab" at the offending gob of goo.
You can experiment using different amounts of applied pressure to see how much you need to pick up the old adhesive.
It's worked with a lot of things for me.
And yes, Goo-Gone can be evil...i destroyed a brand-new motorcycle helmet with it last year, before i even got a chance to wear the damned thing.
Grrr.

overspray it with spray...
overspray (as in spray more than normal on such a small space) it with spray polish and leave it for about 3 mins then remove most of the sticker then spray again if necessary to remove the gum residue works on most things for me.

This only works on paper...
this only works on paper & books, etc. SOMETIMES, depending on the surface. But a really sharp razor blade is what I use on my books. It works great (as long as your careful and don't chip the surface), cuz goo gone will leave a greasy looking stain.

Lighter fluid is...
Lighter fluid is king...gasoline or kerosene for the really stubborn stuff...these work miracles. WD40 might leave a residue, thanks to the detergents.

carburetor cleaner
toss a can of carburetor cleaner into the mix here. as with any other solution, it should be tested first on the surface in question. but it works wonders on cutting greasy goo.
another chemical is acetone. i've used it when working with plastic laminate [formica, pionite, etc.] and contact cement, and those fingernail decorating people use it to improve the air quality of their respective establishments.
of course, volatility is always a concern for almost anything other than water, so be sure to follow manufacturer's instructions for safety at every level. common sense also helps quite a bit.