NAVER Ndrive gives you 30 Gb online storage - Android Apps on Google Play

Definitely will give dropbox and sugarsync a run for their money! 

Unfortunately it's in japanese but with google translate you shld be able to make things out 

http://ndrive.naver.jp/

30GB free online file storage space.You can view valuable files offline.

Free 30GB file storage space on the Web,Android app, that is NAVER Ndrive.
You can access to your files at anytime,anywhere with Ndrive APP.

Featuers:
-Easily upload photos and videos on your Android phone.
※each file is limited under 500MB.

-You can view doc,xls,ppt,pdf files,of course in offline mode.

-Sync files in your Android phone to Ndrive.

-Works good as a music player:shows your music files by artist or album,and also shows cover images.
*Only mp3 files are available on NdriveAPP.

-Enable to view photos on slide show.

※ NAVER member registration is required to use this application.

https://play.google.com/store/apps/details?id=jp.naver.android.ndrive&hl=en