Googles just-announced Nexus S smartphone does not have an SD card expansion slot, like most other Android phones have. Which is a good thing.
Like I wrote just a few weeks ago, Android has a serious issue with app data storage, which can currently only be stored on internal storage. App data storage means your email, your calendar appointments, thumbnails from your gallery app, cached tweets, browser cache. That adds up. The problem presents itself when the internal storage has been filled up, and you can no longer receive email until you “resolve the situation”. This is especially a problem when you only have 512 mb internal storage, of which half is eaten by the system. Incidentally, that means the Nexus One and my HTC Desire.
By removing the SD Card option and making the internal storage on the Nexus S 16 gb, Google pretty much solves the problem the way Apple has done it: everything is stored on the same space, and there’s no confusion. Sure, they could’ve gone the Galaxy S way and had 16 gb internal storage plus an optional SD card, but as a flag-ship device whose purpose is to raise the bar for other vendors, this sends a clear signal.
Besides, if Google gets their act together and launch Google Music, you’ll probably be wifi syncing & caching your music with no need for more space.