Sending big files through internet

Most email hosts do not allow users to upload or send big files, sometime not bigger than 1 MB. So, how to overcome this? I have been using an application which can be download free from the internet YouSenIt. But if you want a better version you have to buy it. For a start we can get it from http://www.yousendit.com/ for free due to its simplicity. I find it convinient to send big files but one file at a time, if we want to send multiple files than again we have to invest some mony by buying it. I am not promoting the company but rather its usability is more important here. So try it!!!!.