IEEE vs ACM membership
I was a full member of both IEEE and ACM in the past year (2014). I tend to like ACM. The CACM seems to have better quality articles and they are more CS-ish compared to IEEE which I felt are more CompEng-ish. I also prefer ACM because they send more meaningful mails and less spam compared to IEEE. For instance, ACM will send you a customized list of articles based on your interests.