For a long time Google and Apple have had an interesting relationship. Eric Schmidt, CEO of Google has sat on the Apple board of directors. Not that it is unusual for executives to do this when two companies want things from one another, but this must have been a strained relationship for a long time.
Both make web browsers (Safari/Chrome), phone platforms (iPhone/Android), operating systems (MacOS/Chrome OS), music players (iPod/Android) and several other overlaps. At this point, I would imagine Steve Jobs probably doesn't let Eric Schmidt stay for much of the board meetings, because other than hardware, the two companies are now adversaries.
That being said, this week Apple announced that Eric is leaving the board. They said in the press release: