To my mind, pdf currently offers the best compromise between printability (which everyone seems to agree is important) and on-line viewability. I could wish for improvements in both, but it's not bad at all. The biggest problem seems to be that data sheets intended for printing tend to have really small fonts by display standards, so it's difficult to get a "full page" displayed on a monitor at any one time (and of course screen and page aspect ratios are a complete mis-match.) Someone mentioned that pdf files couldn't be searched. The last time I downloaded acrobat (3.0, I think), a search feature was one of the downloadable options, so perhaps that HAS improved... (now, a natural language database capable of searching and printing data sheets with pdf quality... That would be sweet!) BillW cisco