You should really install this great Firefox extension: http://www.quirk.biz/searchstatus/ It highliths all NoFollow links and make it very easy to check if a link is no/dofollow Signatures in that forum seem to be DoFollow.
If you meant the signature links in it , yes they are dofollow if the old method is still working. Although I'm not a pro in this field so there will be others who can confirm that.
That tool is fantastic.. I'm not sure if it is the same one, but the Firefox extension I dowloaded highlights all no-follow links, and includes Alexa, PR, and compete people count in the same program. Im not sure of the link but I think it might be the one that is listed above.
In firefox, just right click a link and go to "properties". If the link is nofollow, it should show up there.
I also use SearchStatus adds on. It's really useful to easily determine which links are dofollow or not..
I also use SearchStatus adds on but,please brief information about this tool Please give me tutorial about this tool
you dont need any plugin the check it, if you use firefox, just right click on the signature link and see properties. That is why I call firefox is webmaster browser