How many is too many tags ? what happens if I delete them ?

[cctvinstallers]

Hi, I have a lot of tags on some of my pages (maybe 20 on some !)
(im using Wordpress)

I was wondering if this is hurting my seo efforts or helping ?

Some of my tags seem to be coming up wierdly when googled in the format of

http://mysite.com/tag/tag-page-2

(but at least they are coming up ! which I guess is better than not being there )