links for 2011-01-28: AT&T unlimited data plan for iPhone back; LibreOffice release; iPhone and Google Voice; Startup business models

• AT&T quietly matching VZW's unlimited data plan for iPhone - I never gave up my unlimited plan, but good to know others can get it back.
• First LibreOffice Release arrives - Sounds like a good release, will have to check it out.
• Why the iPhone and Google Voice don't mix - I have not had the issues this story lists, it works great for me.
• Why DropBox won - Good read for folks introducing new technologies that require adoption.
• Kill your business model - Another good read on the same subject.