I agree with Kathy Quinlan. It would be very good, to have possibility to upload usefull files. For instance, I am beginer with 8051. I have found a lot of usefull information on this site, but not every thing. Now, I have a lot of documents in my PC, from other sites. I could upload them for other beginers. May be some of documents appear not interesting for gurus, but they are necessary for those, who starts.