Megaupload, Bigupload, and hundreds more
> Well, first try was a 79min. 320kbs big file that didn't
> finish uploading with no explenation. Second try was a 73MB
> 128kbs file that uploaded to 71MB. Then a few minutes later
> when I checked to see if it was done there was an "error"
> message saying, "You will need to upgrade your Box.net
> account to upload files larger than 10MB". I thought I read
> 1GB was the limit for the free account.
>
Have you tried Megaupload.com? It has an interface similar to YSI, with a max file size of 250 MB (lowered from 500 MB). There are some porn sponsored links, but it works okay. Plus you are able to use a download manager - important for slow connections.
There's also Bigupload.com with a 2 GB limit and a similar interface to megaupload.com.
And if that weren't all, here's reviews of HUNDREDS of other file hosting sites:
http://www.filehostingreview.com/File_Hosting
One of them has just got to work better than YSI.