Google hasn't published a list of titles, for some reason, but they've started adding lots of page images from a variety of magazines, some going back to the 1800s.
Start at books.google.com, and click on the small "Advanced Book Search" link that's to the right of the search box. If you want to find a particular magazine, use its title as a phrase search (as an example, type Mother Jones into the exact phrase box). If you want to look for topic in that magazine, type those keywords into the topmost search box (for example, type in pesticides). Be sure to use the radio buttons to restrict your search to magazines. You can also scroll down and specify years, to make sure you get only recent articles. (Or, for nostalgia's sake, you might enjoy a search in something like Popular Science for a time span like 1850-1900.)
This article has a little more information on this project, for the curious.
And don't forget the Library's vast access to full-text magazines, available through databases we subscribe to (notably Masterfile). These databases can be access by all in any library, or from outside of the library by current resident card-holders.