Syncing bookmarks and open URLs
Apple's Safari 6 in iOS, OS X, and Windows has a neat feature called iCloud Tabs that syncs the URLs of all open tabs to all other devices using Safari 6 tied to the same iCloud account. Bookmarks are also synced across these three OSes.
Again, there's no way to open up Safari's iCloud tabs and bookmark syncing to Android -- so don't use Safari. Google's Chrome browser has a similar sync capability, and it's available for Android, iOS, OS X, and Windows. (Firefox can also sync across platfiorms, but recently dropped its iOS sync app; it's not an option if you're using an iPad or other iOS device.)