One of the first strategies I adopted last summer: NOT to do the mental conversion. So, I can say pleasantly to myself, "Oh, only 2 pounds 30 for a pint? I'll have a couple."
in denial in the Midlands...
About the only thing I find that *is* rewarding for doing the mental conversion is a pint, actually. First, in a reverse of the typical pattern whereby American size=supersize and the British one=mini, the imperial pint is 20oz, while the American is 16. Additionally, at least where I was, a pint would routinely cost around $4.50, plus throw in at least the next $.50 or even $1 for tip. Even at today's exchange rate of $2.10/£1, from this perspective your £2.30 pint (for which you needn't leave a tip) is looking like a pretty good deal.
I find it very, very fitting that beer is one of the most affordable things here. :) Coffee, on the other hand, is a complete disaster, particularly if doing the in-head conversion... I find that also fitting.
Now, back to my back-of envelope calculations about in how many days at the current rate of devaluation the fiver in my pocket will buy me a swank co-op in manhattan...