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Just pasted "Elsevier" into iTunes and got a whole lotta apps listed. Most at $39.99. I would guess whoever is doing it for the iPhone/iPod touch may update them for the iPad.... but you now know as much as anyone else.
 
Well, you could go through this route:

Get Papers, or Zotero or similar. Then you can hae a content management system. Papers i know has an iPhone app, and likely soon an ipad app.
You should be able to collate and store papers that way.

As for accessing papers - there will likely be a SAVE function - so you could save the pdfs from a link from say pubmed results
 
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