The Weu, makes it so you can have doodads above blizzards max size, a very usefull thing (go to start < programs < WE Unlimited < WE Enhancer[to create a new map with the ability to go above the max size limit])
Inside the WE Enhancer there are some other options, by click custumize toolset you can then add more tiles maxing to 16 tiles way above blizzards preset, amoung with options like extended trigger options prebuilt trigger systems, hero glow modles so you can make thoses hero modles that dont have one or normal wc3 units have one, tree modles so you can make units have tree modles, make it so you can build on unbuildable tiles, and more however i beleive there are tooltips if you hover your mouse over each check box, i warn you on protecting your map with WE Enhancer though.. as you may block your map from your self =P.
Also allows the user to raise terrain higher then blizzards presets, so now you can make thoses realistic hills, and mountains.
There are probably some features that i did not mention but there should of been a how to with your instalation or at least with mine there was.. not fully complete but it was helpful.
I might check helper net too if you'd like to find tuts about WEU, they have tuts on just about everything >.< lol
~Shougun
hope this helped a bit