The Bytown Ukulele Club is an excellent source for new songs and new arrangements. They have gathered songbooks from various ukulele gatherings around the world (eg Wukulele in Worthing, TUSC in Taunton) and posted them on this page:
http://www.bytownukulele.ca/Songbooks.aspx
There is also a good page with individual songs available for download. See you on Weds! Al.