Some of this may probably already be covered by others, but this is all the advice i have come up with.
1. Have a top 10 downloaded mangas - list so people can check out the best mangas around.
2. Order the mangas in a better style - possibly alphabetical and with at least captials etc.
3. Group the downloads into volumes instead of chapters - it is really bothersome to having to constantally check the downloads. It would be better if they were grouped into volumes because u can just leave ur downloads on.
4. Make sure the translations are done properly - eg. in the some of the GTO volumes, the text read from left to right....tho this is the western way it really is troublesome. Keep a constant rule.
Aside from those 3 problems expressed above, i really like this site. Lots of mangas to download, pretty good quality thus far, connected with a good forum and overall is nicely laid out.
Keep up the great work...i love manga!! ^.^