I've been playing the bass for a long time, and I used to know how to read music fairly well, but have since been out of practice.
Can you recommend any books that would help sight reading? I have seen many on Amazon, I just don't know which would be best.
Any other tips would also be appreciated.
Scott from SBL did a segment on this a few weeks back. A couple of sight reading books he recommended are: "Simplified Sight Reading - Josquin Des Pres
"Complete Electric Bass Player Book 1 - Chuck Raitieg
(spelling may be off - can't read my own notes! - unfortunately, unintended pun is actually accurate for both words and music....)
I can't confirm the value personally (haven't got them yet), but Scott hasn't steered me wrong yet....
If you've read music in the past, I agree with Malcom - any music with bass clef will get you back in the saddle pretty quickly. Reading the rhythms will likely be more challenging than the tones - at least it was for me.
Do yourself a favor and try to focus just on bass clef music until you lock it in (assuming you ever want to read a treble part). I am kind of in the same boat - used to read like crazy - any clef, any variation of the clefs (Bb instruments, Eb instruments, tenor clef, bass, treble etc) and could pretty much sight read any instrument's part on any of the horns I played (could read an alto sax part while playing tuba or a tuba part while paying trumpet, for example). I also let that skill lapse for many years. Playing rock didn't require note reading, but now that I'm focusing on jazz, I'm finding the skill to be necessary. My relearning has been severely hindered by trying to work treble and bass notation at the same time which is very confusing. It's a valuable ability, but it's better to get one locked in before working out the other.
Another trick that help your reading skill is writing. Write down some bass lines - you'll get back up to reading speed in no time.