Anyway, after seeing you had a limited number of maps i thought i would start learning to map again to help out and i came across this book.
Half-Life 2 Mods for Dummies

This is a new book out about how to make mods (mostly how to make maps) and i found it pretty useful and even has some information for advanced users.
For more info go to
http://www.amazon.com/Half-Life-Mods-Du ... 350&sr=8-1
Also if you want an ebook version to see if it would be useful to you then go to http://www.flyingcowstudios.co.uk/Half_ ... ummies.zip
(Its in PDF format and its the full book, without the CD)
*Goes posts 2 times so can post URLs*