When to use icons vs. icons with text vs. just text links?

Are there any rules on when to use icons vs. icons with text vs. just text links in a web application?
For example:
vs.
save
vs.
save
Extra question: Is save -or- save preferable?
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Should a toggle button show its current state or the state to which it will change?

I have a quick question about buttons that toggle between two states. (Think Play/Pause, or Shuffle/Regular Play.) As the title says, should the toggle show it’s current state or the state to which it will transition?
I think people are u…
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Using "Sign in" vs using "Log in"

Is there any research in this area, it seems “Sign in” is more common and hence more recommended.
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One scrollbar or two for content + sidebar?

I’m working on a website design and trying to decide whether to have the sidebar scroll independently of the page content, or have just one scrollbar control both divs. What principle should I use to guide the decision? In which situations…
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Best practice for Anonymous Donation forms?

Donation forms are meant to be easy to use. Easy enough to use implies that it may convert the casual website visitor into a donor. We are currently using the fields:
Card Type
Card Number
Card Expiry
Name on Card
CCV Number
$ Amount
…an…
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What should be included in a standard web UX/usability audit and recommendation?

UXers here probably audit existing websites or pieces of software that are already established. Sometimes, we are involved in designing them from the start, but for times when we are not, we just have to audit and list recommendations for …