For the areas they cover, being a member of the relevant IEEE group can be useful (I guess ACM probably does something similar but I'm not a member). For one of the groups I'm in, I receive a pamphlet every few months that summarizes a ton of papers in the field and a CD with the full content on. (It's all online as well, but I know I'd never remember to actively check there.)

You may also find the relevant section of http://arxiv.org/ useful as well. For example, http://arxiv.org/list/cs.SE/recent