X is not Windows, and that's the problem
I love speedy interaction with my operating system. I'm a vi and mutt user and I don't mind getting getting dirty in config files. My biggest gripe, though, is that Linux can't hold a candle to Windows 7 in terms of window management.
I have dual monitors, one 1920x1080 and one 1080x1920. Windows recognizes that I need an L-shaped desktop. X insists on giving me a 1920x1920 desktop that my mouse disappears in regularly. I'm sure I could fix this with a script or something that binds my mouse inside my monitor dimensions, but I'm sure this would break something else.
My second issue is more fundamental. I can't live without the Win+ArrowKeys windows management features. Win+Up maximizes, Win+Down minimizes, Win+Left and Win+Right can tile two documents vertically on my screen. It's all very intuitive and makes multitasking a lot faster, which as I said before, is a most important feature for me.
So, is there a Windows Manager out there that can be easily configured to fix these two issues?
The Problem with Windows is that it's not X
I don't know about tiling windows on a desktop. I find switching between multiple windows on the same desktop is a bit of a mission, even with keyboard shortcuts.
What you can do is have multiple virtual desktops, each with one or more apps running. To switch between them, press either <Ctrl> + <Alt> + <Left> or <Ctrl> + <Alt> + <Right>. To switch between windows on the same desktop, hover your cursor over the bars in the relevant panel and rotate your mouse wheel. If this fails, you can always use <Alt> + <Tab> + <Tab> (Hold down <Alt> and press <Tab> to show all open windows on the current desktop. Still holding down <Alt>, press <Tab> the requisite number of times to switch to another window.)
EDIT : The file manager for KDE is Konqueror (which can also be used as a simple web browser).