SimpleMachines does a pretty good job on my side. I don't have much spammers on my forum...believe it or not, only had one that actually posted something in my forum in all these years I've been using it.
I don't have version 1.0.8 installed, but does it have image verification during the registration process? Go to register now and see if it asks you to enter the random letters/numbers in a box. If not, then it doesn't have it. You might want to update to v1.0.9 at
http://www.simplemachines.org/download/?archiveOtherwise, do the full upgrade to the final 1.1.1 stable version that was released last month. I'm using it now and it's been running pretty well as usual. Even when I was running the released candidate versions they were good. As usual, make sure you backed up your entire SMF directory and also make a backup of your SMF database file in case something does go wrong. Then do the update/upgrade.
If you need any help with this, feel free to post back.
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