I got one also. See below:
Message Details
lilian200 hi
October 09, 2010 at 12:33 PM

lilian50asiku@yahoo.com
Hello.
My Name is lilian. I was impressed when i saw your profile athttp://www.concrete5.org and i will
like you to email me back to my inbox so that i can send you my picture for you to know who i am.i believe we can establish a long lasting relationship with you.
In addition,i will like you to reply me through my
private e mail box (lilian50asiku@yahoo.com).
This is because i dont know the possibilities of
remaining in forum for a long time.
Thanks,waiting to hear from you soonest.
lilian.

I've sent the core team the info. They should be removing that user shortly. Thanks for reporting this.

Is there a better way to report this in the future, or should I just post here?

I would use the contact form or send the member 'frz' a PM directly. There are quite often too many forum posts in a day that it could slip by the core team.

Thanks!

a new system is going to be implemented (and is available in the svn) that when a users sends a bunch of PM's the administrator is emailed,

If anyone wants to chime in on spam control libraries - check out this thread:
http://www.concrete5.org/community/forums/customizing_c5/core-spam-...