The new software is quite efficient at spam fight and blocks spammers most of the time before they even have posted their first message. We usually delete between 10 and 20 spam accounts per day.
Some spammers still are able to post on the forum and you usually flag their post so we can remove their message fairly quickly.
If a spam post is flagged multiple times it is automatically hidden for all the users.
So, please, report them as it benefits the community even before a moderator has a look at it
That said, I just installed a new feature (using Askimet) that should increase the spam block efficiency, so if everything is working well, you should see even less spam on the forum starting from today.