A company called Streamload is offering consumers a free 10 gigabyte online storage locker for multimedia files, potentially raising the stakes for larger companies such as Yahoo and America Online. Streamload typically provides online storage space for a price, making it one of the few companies to survive in that business through the dot-com shakeout. However, it is increasingly competing with larger companies that offer online homes for digital photographs, and even the huge archive space provided by Google’s Gmail service.