pkg_add: Updates and dependency cleaning

[Tom Doherty]

Hello,
Please could someone familiar with pkg_add(1) confirm whether the 
behavior I'm experiencing is normal?
My mail server has many packages installed that I like to keep up to 
date using pkg_add -uiv
However, pkg_add seems to get confused with regard to the versions of 
the packages.
For instance,
[EMAIL PROTECTED] ~ $: pkg_add -uiv
Error from http://openbsd.blueyonder.co.uk/pub/OpenBSD/3.9/packages/i386/:
Successfully retrieved file.
Candidates for updating clamav-0.88.2 -> clamav-0.88 clamav-0.88.2
Ambiguous: clamav-0.88.2 could be clamav-0.88 clamav-0.88.2
Choose one package
        0: <None>
        1: clamav-0.88
        2: clamav-0.88.2
Your choice: 2
Candidates for updating curl-7.15.3 -> curl-7.15.1 curl-7.15.3
Ambiguous: curl-7.15.3 could be curl-7.15.1 curl-7.15.3

.....

Is this expected behavior?
Also, previously on the list [A little script to remove packages don't 
needed] a script was posted to remove dependencies that are no longer 
required but was contested as buggy. What is the recommended way of 
doing this?

Thanks for your time,

Tom