For most purposes they can only be downloaded from the market place. You could get the file downloaded from your computer, put it on the SD card and use a file manager to extract it to where the apps are located. (Would require alittle knowledge to do)
Yeah was just saying there are other ways of doing it, just it would be alot better for most people to use the market place. The apps are up to date, lol most of the time, and pretty easy to search for using the search function too.