Understanding dsbl?

One of the computers that a colleague uses has an IP in dsbl.org. The
IP is 200.79.150.31, and it has been in dsbl for presumably over 1
year.

http://dsbl.org/listing?200.79.150.31

I assume that this is a dynamically allocated IP, and that it is in the
list because another computer at that IP was a source of spam.

I note that (a) only the postmaster responsible for this IP can
initiate removal of the IP. Telnor is a monopoly, their service is
(much) worse than US ISPs (hard to imagine) and I doubt that they will
initiate removal of an IP, but I could try.

I note also that senderbase doesn't seem to pick up the listing at
dsbl.org 

http://www.senderbase.org/search?searchString=200.79.150.31

Perhaps senderbase has a reason for ignoring this list.

However, spamcop has dsbl near the top of the list of additional
filtering lists (see options under Horde).

So I guess my questions are

* any advice on how to get this IP out of dsbl
* do people really filter email using dsbl
* is dsbl considered reliable

Thanks

A