WordUnscrambler.com and UnscrambleWords.com are two resources that find words or word combinations hidden in random groups of letters. Both of the sites work using similar parameters.
WordUnscrambler.com allows the user to enter up to 12 letters, including two wild cards denoted by a question mark. Wild cards, in this case, are unknowns, such as the blank tiles in a crossword puzzle game. The site also offers a choice of two dictionaries from which to find words.
UnscrambleWords.com works much the same way but includes a minimum length for the words as well as maximum of 12. It's also possible to select what letter the word should start with, which letters it must contain, and the letter with which it ends. UnscrambleWords.com has four dictionaries available.