I think it would be a nice feature of IDM to show the total size of your files and how much has been transfered, Something like

QUOTE
We have a total of 214 files in 16 categories
A total of 5 unique authors have submitted to our site
There have been 2919 logged downloads to date



Instead...


QUOTE
We have a total of 214 files (12.2GB) in 16 categories
A total of 5 unique authors have submitted to our site
There have been 2919 (85.5GB) logged downloads to date