I'd first like to say that you've created an invaluable app that I have used continually for a long while.
I use Folder Size as part of my default Explorer column set up under Details view [Name; Folder Size; Type; Date Created; Date Modified; Date Accessed] and is present in all folders; the only change in those being that some are set with different view groupings.
If I mount any external drive and view that drive in Explorer and then close that drive's individual Explorer view, the drive won't eject when I right-click it under My Computer and select that option from the context menu. It gives the usual 'drive is in use' type error.
If, however, I select the "Unlocker" option [http://ccollomb.free.fr/unlocker/] from the same context menu on my set up, I find that the only process locking the drive is Folder Size. If I terminate this (which appears to not actually terminate the Folder Size Service completely, as it still runs happily in other folders) I can then eject the drive without issue.
Just thought I'd let you know of this irritation as, if I wasn't using an app like Unlocker, this would be causing more trouble, as I'm sure it could for others.
Besides this, keep up the good work. It's appreciated.
FYI: Win XP Pro x86 w/SP3 + all updates to date [apart from things like Windows Search 4.0, Live Update, SilverLight x and anything else that MS invents to break your computer in Vista styled co-dependency ways]
See this thread.