Eric Grossinger released an XNA Terrain Editor.
Functions:
Create or modify heightmaps and color distribution maps.
Rise, lower, flatten or smooth the terrain.
Generate a random terrain.
Paint textures on your terrain.
Day-Night lighting cycle.
Import/Export heightmaps and colormaps
Save/Load Terrain xml filesand more..
You can download it here.
I saw this pop up earlier but I am still unable to hit the gameprojects.com web site to check it out 
Any chance you could put up a screenshot of the editor for us to see?
Thanks,
Ziggy
Ziggyware XNA News and Tutorials
Very nice indeed That face is pretty creepy.
I like the face 
btw, if you want to download the source directly, you can check this link.
I have to thank you guys for sharing the project with other people and for the comment, I really appreciate it!
no problem
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Hello. Great stuff!! I have one proposition/idea for you. I see that right now you project is working in XNA 2.0. One month ago I was trying to move it to one window and XNA 2.0. But is crashes as start displaying open file dialog. I studied a lot your code. And I think that it will be great to make caves in this terrain and save the terrain in another way than heightmap. Maybe I’m wrong … maybe it can cause a lot of problems with shaders and textures, maybe not:). But I think that your triangle collision function to place a ground cursor should be still OK. For me it will be very good to add to vertices highlighted by cursor ray direction vector multiple by strength. In this way it is possible to make caves probably:). That is only my idea. Probably you know it better:) … I’m just computer science student changing your project for my style of work:) trying to use it to my 3d game:). But writing something like this from zero for me – incredible:). I’m waiting for your answer.
Cheers
Piotr … p.s. sorry for my English I’m from Poland …
Hello im tyring to import my other files i used to have when i created my mmo online game there in a diff file format is it possibel to switch them to this file format?
if not what programs should i use to create stuff liek housees sprites and stuff for me to see in this editor
hi, will i be able to use this programme to create terrains for my games on microsoft visual c#? if so, how?
thanks
Does it edit .trn files or Dem files.
Link broken
Nice editor, The is written in 2005 but the project the converts over to 2008 without a hitch. However just clicking on the downloaded .exe I got a System.IO.Filenotfound exception. (Missing File?) I was able to run it in the debugger and it produced some nice graphics. It is a little hard to work with without a user manual.
Is the link still up? Every time i click on it it says connection timed out.
The link is still up. Working fine here
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