Apple has just released iTunes 9.0.3 via Software Update. The changelog mentions several bug fixes, including:
• iTunes no longer ignores your "Remember password for purchases" setting. • Addresses problems with syncing some Smart Playlists and Podcasts with iPod. • Resolves a problem recognizing when iPod is connected. • Addresses issues that affect stability and performance.
It appears that today's 90+MB iTunes update is related to the iPhone 3.1.3 release earlier today. I wouldn't be surprised if both contained iPad-related code.
It is also worth noting that iTunes 9.0.3 is safe to use with jailbroken devices according to a Modmyi forum poster.