There's a new book from Dover that looks promising if you like singing old-time songs with a group. It's called 500 Best-Loved Song Lyrics. I suppose I'd agree that Rise Up Singing is flawed, but I still think it's the best group singing songbook currently in print. I don't know if the Folksinger's Word Book from Oak Publications/Music Sales Corporation is still in print, but I occasionally see it in stores - it's a bit pricey at $35, but it's good.
Songs for Swinging Housemothers is a great resource if you can find a used copy, but it's long out fo print. Some other out-of-print gems that are commonly available in used bookstores are Ditty Bag, 357 Songs We Love to Sing, and one that I think is called Songfest. There are also several Fireside books that are good for group singing. You can find used songbooks at www.bookfinder.com.
-Joe Offer-