FTPii which runs on the Wii.
Then use Filezilla (or most any other FTP progarm) on your PC to transfer files to SD or the HDD if you have one.
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ftpii
joedj
0.0.21
20100227170000
An FTP server
ftpii is an FTP server. To exit, hold A on controller #1 or press the reset button. To remount a device, hold B on controller #1. To specify a password, rename the apps/ftpii directory to apps/ftpii_YourPassword. To specify a password remotely, use the SITE PASSWD and SITE NOPASSWD commands. A working DVDx installation is required for the DVD features.