As other users have stated, the 30-second in-browser samples have been around for a long time now, and they obviously have nothing to do with Apple's acquisition of Lala, as:
1) Apple has had these same 30-second samples in the iTunes Store since its inception.
2) Lala's music is encoded in MP3, not AAC.
3) Apple didn't acquire Lala to use them; just to stop Google from acquiring them.
This. And let me add:
4. Lala allows for a full preview of the entire song once before going to 30 second previews.
Can someone at Macrumors sign up for Lala and use it before spouting off about it. The Lala mis-information on this site is getting old.