Here are some journals that very frequently solicit my expert opinions, without really checking whether I have the expertise or not, and without any impact factor.
Hindawi Publishing Corporation
22 of 300 journals have impact factor above 0
Some other researchers impressions: http://list.uvm.edu/cgi-bin/wa?A2=MEDLIB-L;wGArog;20110726180255-0700d
- Advances in Bioinformatics (Impact factor: 0, Registered in PubMed Central, Spamming a large number of potential authors)