First time in this group: Do any of the modern digital cameras have a "B setting" (Bulb)

From another site:

All the DSLR's have Bulb. I shot for 8 hrs during the blue moon. 30 sec - 4 minute exposures... took over 40. And I my battery bar never went down.

Nikon D70, Minolta X-7A, Yashicamat 124G

They're out there.

Probably not the point-n-shoots.

Some digital cameras limit long exposures to 30 seconds or so. For some cameras, this can be overridden with an accessory cable or remote shutter release.

Another thing to keep in mind is that digital cameras will typically accumulate digital artifacts if the shutter is left open too long due to thermal signal, which is why some cameras have a long exposure noise reduction feature.

You can read about it here.

http://www.democraticunderground.com/103610941

If you want to take seriously long exposures, minutes, then you're going to need to optimize dark frame subtraction, a lot of cameras will do DFS automatically in camera for longer exposures than a second or two but you can do a better job outside of the camera with software.

http://en.wikipedia.org/wiki/Dark-frame_subtraction

http://www.astropix.com/HTML/J_DIGIT/JPG_DFS.HTM

http://www.takegreatpictures.com/photo-tips/digital-photography/dark-frame-subtraction-using-adobe-photoshop-br-by-chris-limone

I've done bulb exposures with a Canon 350D, there is a port on the side of the camera you plug a remote shutter button into, it's possible to buy automated remote shutter buttons also that will program long exposures or a series of them.

...people are missing out on a lot of sales.
There's quite a few Amateur astronomers who usually buy a separate camera for doing shots thru their
telescope. Needless to say, these "Special" cameras are really not that special except they have a "B"
setting and a cheap holder. ...and just about anybody could make a holder IF their present camera had the B setting. AggggH!

Canon EOS xxD series, 7D, 5D(all) and 1D(all).
Have used it many times on a 40D and 5D mkll.
Length of exposure is only limited by battery.
In "M" (manual), Tv and Av, mode, you're limited to 30 sec.

edit to mention.
It might be a bit difficult to pull off 30 in Av mode.