Ok.
How to move you saved Data into another Computer.
~ for whoever doesn't know ~
Needed Equipment: Flash Drive and Saved data - Single player, and maybe multiplayer data.
First: Go to My Computer
2: Find your (C:) Drive - Click it.
3: Tools; Folder Options; View; View all folders/hidden folders.
4: Find a Hidden Folder called; Document and settings.
5: Find your Computer Account or Documents - Click it.
6: Find Application Data. - Click it.
7: Click/find the Folder called; .minecraft.
8: either copy the whole folder into your " memory stick " or the documents inside it.
9: Test it and see if it works; IT Should work because i've already done this and it worked perfectly.
10: Have Fun! and hopefully this worked so that you can edit your maps/lands on any computer.