Wrought- work or wreak?

Greetings again,
today I've run across a slight problem with meaning of this word 'WROUGHT'. Since I had never seen it before I immediately put it into my Cambridge Advanced Learner's Dictionary to see what it means. It said it is past participle of the word 'WREAK' and that form 'WREAKED' is also possible. Nothing unclear so far, yet, because I didn't know how I should exactly translate it, I had 'wrought' looked up in www.dictionary.com. To my surprise, it found it means 'WORK', with this comment:

'The past tense and past participle of wreak is wreaked, not wrought, which is an alternative past tense and past participle of work.'

And that leads me to my question, How it really is? Does it mean 'work' or 'wreak'? If only wreak was correct how come that CALD would mislead me??

Thank you for your answers in advance.

I was hoping you would answer:-) I'm most greatful to you. So that note on dictionary.com is deceptive, then.
EDIT:// I haven't seen the last sentence of yours^^ That would explain why there are diferences...

I see. I have Merriam-Webster at home, and I couldn't find there wreak (as 'wrought'). But besides this, it is OK to use 'wrought' as wreak, isn't it.

It seems things are under dispute

http://encarta.msn.com/dictionary_/wrought.html
(see the end)
Word Usage

Wrought is an old past tense and past participle not of wreak (for which the past tense is wreaked) but of work: it is the equivalent of modern worked. Wrought survives mainly as an adjective in a few, rather specialized contexts such as wrought iron; it is seen also in the set phrase What hath God wrought (used by Samuel Morse in the first successful test of the telegraph). Wrought havoc is not correct; it should be wreaked havoc.

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but I'd take Oxford's view, which is more explicit than Cambridge in this case.