Production limitations that were hurting iPad shipments last quarter have "significantly improved," with "better yields and higher output due to successful retooling and conversion of more production lines to iPad 2," claims Sterne Agee analyst Shaw Wu. "From our understanding, it still has a ways to hit the 2H goal of 3-4 million units per month but getting closer," he writes in a new memo. The note was created prior to news of an explosion at an iPad 2 plant.