I completely agree about Springer and Elsevier, but the ACM and IEEE both offer "Digital Library" subscriptions that give you complete access to the entire archives of all of their publications for a couple of hundred bucks a year (including their membership fee.) That's a small price to pay for the quantity and quality of material available, at least in my opinion-- and I'd be ecstatic if Elsevier or Springer offered a similar option. (I've probably paid more than that to Springer this year alone just to get a half-dozen individual articles.)