susanmt, another vote for the parenting classes run by our HVs at our local GPs. Six to eight weeks, sessions included teeth & gum health, weaning, baby massage, essential first aid, immunisation pros and cons (the HVs wisely acted as "facilitators" for that one and kept out of the hot debate, but a big thumbs up for acknowledging parental concerns on the issue), and a Christmas party, which was purely social and the last session. I am still in touch with one good friend I made through that group, and have nice reunions with about six others 2-3 times a year.
Also I think a good HV should offer:
A knowledge of the differing types of parenting book on offer, and a willingness to recommend a selection of titles (this was what sparked your involvement, wasn't it!)
A willingness to cut to the chase (off the record) as to which local GPs despise babies and which actually enjoy dealing with them and their parents
Local info such as where the best paed A & E is (assuming you are within 100 miles of one)
Lots and lots of URLs to pass on
A really fab HV would organise ongoing parenting sessions in the evening (as well as daytime, to reach as many parents as possible) on toddler taming, child development milestones, sibling rivalry, settling children in daycare/playgroup, etc. Aren't they responsible for the children until the age of five?
Good luck and well done you for carrying the cudgels. I hope they did not make you feel even 0.5% bad about your ex-health visitor leaving.