I keep forgetting this so I thought I would drop a qick post on the WordPress Maximum upload file size.

The value is set on a per blog basis in Network Admin > Settings and is generally set to 300KB.  This default value can be increased up to the value set in the file wp-admin/php.ini

[PHP]
; Increase maximum post size
post_max_size = 500M

; Increase maximum upload size
upload_max_filesize = 500M

NB You may have to create this file.

The figures set in this file sets an upper limit for all blogs.