[robdog2004]

cloud does support artwork
just right now the only artwork supported is embeded artwork in the music file
if you just add album art to the song through winamp it does not always embed the artwork into the file

as for arrows the right pointing arrow generally means there is typically a menu, if grayed out means menu is not available
down arrow means menu has been expanded
for any other arrows im not sure what you mean

if you have not recieved your email yet dont be discouraged as im sure there is a back log of applicants

as for storage there is space to have 100gb service it will have a cost to it
for 5gig itself you can get a lot of files (depending on quality and file size)
i have 200 songs on my 4 gig flash card on my phone and still have more than 3 gig left

as the cloud is still proof of concept the finals are not completely set
recommendations to make it better are still being accepted