I generally avoid anything remotely close to a " well-known" trademark, unless I can see some other potential use that would not be seen as a violation to a reasonable person, a judge, or WIPO panel. You really have to go on a name-by-name basis. Two examples are below:
Pepsi - if I saw Pepsi.info available, I would not even attempt to get that name. It's too big, and too popular and the word is not used for anything else I know of.
Coke - If coke.info were available, I would have a very slight temptation to try for it. however, the only chance to avoid problems would be to use it (quickly) for a company that sells coke, a mineral used in the making of steel; or an informational site on the use of cocaine for which coke is a slang term. Since coke (not Coke or Coca-Cola) is a real dictionary word for other than a softdrink, you have some established legal standing to back you up if you have the time, money and wherewhithall to fight it. I also would not use this for a PPC parked site, since it would probably end up being used for the wrong use, endangering your standing on holding it in good faith. Actually, I'd probably pass if this domain were a high cost to acquire, but would probably risk it if I coud get it for a small fee I could afford to lose.
As far as I know, I only own one domain that is trademarked (by a very large retail corporation). This .info name is also a fairly common surname, on which I've set up a Geneology discussion group for the name to establish positively that my intent is NOT to infringe on the trademark. Within the discussion group, I've posted that the name is for sale. I also truly would like to sell the domain to someone with that surname for a moderate and reasonable price rather than have the big corporation own all versions of it. I know people with the same surname as large companies often have little chance of acquiring their own surname domain.
(Please note that this post is not legal advice, but just how I personally operate and decide what is reasonable to acquire and sell without risk of extra time, costs and black marks on my reputation caused by a dispute.)