The WSJ has a great list of Apple’s (confirmed) acquisitions for this year — or at least so far, though further acquisitions seem unlikely at this point.
These purchases, in a limited sense, do not mean much. Many are just “acqui-hires,” or purchases made to employ talented engineers and designers. Taken in context, however, certain trends seem clear within Apple. As noted in the article, mapping technologies seems to be the big ticket on Apple’s list. No surprises, given Apple Maps’ rocky start. Apple is also still purchasing companies with engineers that possess semi-conductor expertise. Lastly, and most recently with its acquisition of Topsy, Apple is interested in companies that have experience in handling massive amounts of data (this also ties in with their mapping initiatives).