If you need to free up system memory or if you think you do but aren't sure, this little tool will provide the help you need.
Instant Memory Cleaner provides an easy-to-use front-end interface for Microsoft's command-line ClearMem and FreeMem commands (for XP and Vista, respectively). It installs an icon to your system tray, and its color provides a handy clue about your system's memory use. When the icon is green, the system's free memory is more than 30 percent of the total physical memory; yellow means less is available; and red means its time for action.
The informative small pane that opens when clicking the tray icon is useful, displaying the megabytes of free physical memory and a check box that verified whether the application launches at boot. Also included are buttons for launching a memory-cleaning session, opening Help, minimizing the pane, or exiting the utility. A final button opens a fresh pane (again, nicely designed) with details on current memory use, including megabytes of Total Physical Memory, megabytes of Memory in Use, and percentage of Memory in Use.