That also saved my *** as external USB memory several times. I am using my N900 with 32GB SD card class 4 up to now without problems. Which other smartphone has 64GB total? ;-) The diverse calendar applications never made any problems for business for me. I can send my calendar dates as ical files from Outlook so I do not need that crappy MS/Nokia synchro stuff. With "Documents to Go" I can even handle Microsoft Office 2007 documents. I can also use PDF documents, I can scetch new ideas with scetch application and mypaint, I can sign PDFs with Xournal. Email works. So for me nothing is missing for business.