While the article focuses on the big-name national agencies, as Adweek is prone to do, the same principle applies even here at the local level. Traditional agencies are looking to beef-up their interactive abilities (es/drake, for example), while at the same time, interactive shops are looking to add talent with traditional agency experience (Blackfin Technology comes to mind).
Are there others? Sure there are. But one point that the Adweek articles misses is that this has been happening for years. Talent moves back and forth, and sometimes back again. The high-profile moves at these large, national agencies have simply served to shine a little more light on the situation (and I’m sure a little PR push helped move the story along).