Omnia's main storage continues to shrink!

[Dandingo]

Hello all! First post on this forum so be gentle.

I have a VZW Omnia (8GB). When I first started using it I noticed that the phone has roughly 90MB of memory which I can access under the "My Device" icon in File Explorer. I also have the "My Storage" icon which is the built in 8GB storage. My question is this, when I first got the phone, the free space on "My Device" was roughly 45mb out of 90mb, it has since shrunk to about 16mb free......every program I have installed has been installed to the "My Storage" memory. I have gone into the phone using explorer on my Vista PC and have found nothing that would justify the shrink from 45mb to 16mb in just 2 weeks.......any ideas?

Thanks in advance.