NOTE: These file will NOT work with BST. I'm sorry...
Jazzed has been kind enough to create a batch file that will allow you to use PropBasic from his SimpleIDE GUI.
Here is how to do it step by step for Windows...
Download the PropBasic_1_42_PC.zip file and extract the files. Put the files into the C:\Program Files (x86)\SimpleIDE\Propeller-gcc\bin directory.
From the menu choose: "tools" then "Properties"
Click on the "Spin Folders" tab at the top of the dialog box.
Change the "Spin Compiler" setting from "bstc.exe" to "propbasic.bat", then click the "OK" button to close the dialog box.
You are now ready to load a PropBasic file.
From the menu choose: "Project" then "Close Project" (this will close any open project, so we can start fresh).
From the menu choose: "File" then "Open"
Change the "Source Files" selection to "Any (*)"
Find and load your .pbas file.
From the menu choose "Project" then "Set Project". (Or press F4 or click on the gear icon)
In the "Project Option" window (lower right of screen), change "Compiler Type" to "SPIN".
You are now ready to compile your PropBasic file. You can use the "Build" (Hammer), Load RAM and Run (white arrow pointing right with green background) or Load EEPROM (white arrow pointing down with green background).
Or even Run with Terminal (screen icon with white arrow pointing right).
I am very excited about this new development with SimpleIDE.
If anyone needs any help getting this going, just let me know.
8/16/2013 I changed the .bat file so the IDE stops if an error occurs. It still doesn't highlight the error, but at least it stops and doesn't load the last build.
8/26/2013 I have updated the files to version 1.42 and included the Linux and OSX builds (thanks to David Betz)