The two examples are seen quite often in literature (especially in technical/medical texts), with the former being more common. Are they strictly equivalent? What subtle nuances distinguish the two? Thanks for your comments.
Ms Google gives me:

267,000,000 English pages for "associated with"
10,600,000 English pages for "associated to".

Still, to sounds odd to me; I would call to a poor cousin to with. I see no nuances of difference myself.

I agree with Anonymous #296250: I work as a writer and editor in an environment populated with native French speakers who write first drafts of technical documents in English. I see "this thing ASSOCIATES TO that thing" with great regularity, but it remains an error in translating "à". It has become so common in technical documents that it is generally accepted, but "ASSOCIATE WITH" is the correct formulation, gramatically-speaking.
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Mister MicawberMs Google gives me:

267,000,000 English pages for "associated with"
10,600,000 English pages for "associated to".

Still, to sounds odd to me; I would call to a poor cousin to with. I see no nuances of difference myself.

Right. Associated to is wrong.

I am an academic and frequently see "associated to" used in papers by non-native English speakers, especially Italian. I'm seeing it so much that I wondered if it might be acceptable, and did a google search and landed in this forum. It seems clear that it is not English, but who knows... it may become accepted at some future time...
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And why not? English is having enough influence on other languages, so why shouldn't there be an effect in the opposite direction?
"Associated to" is used extensively by academics, but native and non-native speakers. There is some interesting collocation cross-overs going on with this. Compare:

1) compared with vs. compared to
2) connected with vs. connected to
3) associated with vs. associated to
4) married with* vs. married to
5) living with vs. living to*
6) contrasted with vs. contrasted to
7) likened with vs. likened to
8) incorporated with vs incorporated into
9) we talked with one another vs. we talked to each other

The difference between 'compared to' and 'compared with' is perhaps better known, with 'compared to' meaning 'likened to', different to 'compared with', which means 'contrasted with'. Most people can see this distinction when it's pointed out.

Some of the other instances mentioned seem to show 'with' and 'to' being totally synonymous, but 'married with...' and 'living to...' show that there are limits to this equivelance. I would suggest that this similarily in basic semantics (they relate to connections - both the participle and the preposition) means that the conventions of one participle can easily 'hop' across to other similar participles.

If you were really looking for a distinction between 'with' and 'to', you can explore the strength of connection. The word 'with' suggests 'alongside', two things that are in proximity but only loosely affecting each other: 'We talk with one another'. Compare this to 'we are talking to each other', which suggests a more abiding state of affairs. And also: 'Your hip bone is connected to your leg bone'.
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"associated to" is wrong.

But more wrong, in my opinion, is to check the frequency of pages in Google when deciding about correctness of English language, or any other language.

Today, when most articles in science and learning are required in English, and when every one can use his/her personal computer to type-in (and so many illiterate editoring staff around...), mistakes of every sort galore!

So many authors shamelessly use the Google listing as some educational reference... even arguing with renown dictionaries or language specialists... We are entering a new era, when illiterate and educated go hand in hand...
associated to implies direct correlation whereas associated with is more generic
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