Script that will remove projects that no longer exist from Sublime Text 2 "recent projects" list.

cleanupSublimeProjects.groovy

import groovy.json.JsonBuilder 
import groovy.json.JsonSlurper 

def session = new File('C:/Users/<user name here>/AppData/Roaming/Sublime Text 2/Settings/Session.sublime_session') 

def json = session.withReader { reader -> 
	new JsonSlurper().parse(reader) 
} 

json.workspaces.recent_workspaces.retainAll { new File(it.replaceAll(/^\/(\w+)/, '$1:')).exists() } 

def builder = new JsonBuilder() 
builder(json) 
session.withWriter { writer -> 
	writer.println builder.toPrettyString() 
}