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POPSYouSendIt If the file you want to send is too big for your receivers e-mail inbox, YouSendIt takes care of it.
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POPSSend files up to 1GB big This is clipped from an excellent blog site, but what you want are the two links to the two websites that let you transfer very big files from one location to another. Need to attach a file, but it's too big for e-mail? Try one of these.
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POPSQuick & easy free file transfers A super-simple YouSendIt.com alternative. Upload a file up to 100MB and get a private URL for the file. Do whatever you like with the URL -- send via email or IM, etc., post online, etc. Files are hosted for one week max.