I have been wanting to get more range and subtlety into my electric guitar playing and have been experimenting with playing without a pick.

I know this is something that the likes of Jeff Beck, Mark Knopfler, and Lindsey Buckingham are known for.

Does anyone know of any good books, cd's, or dvd's that would deal with fingerpicking/fingerstyle guitar in a rock context?

There's a monthly magazine, called "Fingerstyle Guitar". It covers all styles. Lots of tabs, and a CD.

I would look into country guitar instructional materials since those guys ALL use hybrid picking which is using your pick in conjunction with 2 or 3 fingers for various techniques. Country licks transfer extremely well to rock playing.

You should also check out some lessons on Travis picking which is the fingerstyle approach heard on Dear Prudence and Dust in the Wind to name but a few.

What fender_bender said. Take any tune that you know, and play it with plectrum only, pick and fingers, and thumb and fingers. A fourth option is to play the tune with thumbpick and fingers, although I've never put in the time to get comfortable with such.

"Dust in the Wind", "Cannonball Rag", the reading of the Joan Baez tune "Babe I'm Gonna Leave You", from the first Led Zeppelin record, Buckingham's bit on "Rhiannon ", Floyd Cramer's "Last Date", Palchabel's "Canon in D", Jerry Reed's "Bluefinger", Scotty Moore's work on early Elvis records, such as "Mystery Train" - all are but a few of the excellent vehicles for getting a handle on this stuff. For that matter, you could spend the rest of your days delving into Beatles tunes - take tunes that aren't primarily guitar-oriented, such as "Let It Be", or John's "Imagine", and arrange them for guitar.

Immerse yourself in tunes. Keep in mind that the guys mentioned - Beck, Knopfler, Buckingham - are guys that have a few years under the belt. They learned from Cliff Gallup, Chet Atkins, The Beatles, Les Paul, and many others, and they did it the hard way - by soaking up tunes by ear.

If you do find, say, some some fake pedal steel bends or rockabilly/Travis alternating bass syncopated figures along the way that you dig... - do as fender-bender alluded to, and apply them to your material. If it's totally left of center at first, I'd say you're on the right track.