Editor’s note: The following review is part of Macworld’s Summer of Mac Gems series. Each business day until the middle of August 2008, the Macworld staff will use the Mac Gems blog to briefly cover a favorite free or low-cost program. Visit the Mac Gems homepage for a list of past Mac Gems.

One of the biggest complaints about Leopard’s Spaces feature is that you can’t switch between workspaces by dragging your mouse cursor to the edge of the screen.

Kent Sutherland’s Warp 1.1.1 fixes this omission while also adding several other useful features; among my favorite options is one that can display a preview of an adjoining workspace before you decide to switch to it.