If "the customer's always right", then, for the current search situation, you have to ask: Who's the customer? -- P.S. Google: I'd accept, gratefully, as a stopgap, being able to specify multiple "site:foo" parameters. I don't know what the computational (or financial) impact to you would be. (So far, I've held off trying browser extensions to accomplish this, but I guess I can start looking for one having a good rep…
If you want this ability for one-off searches, you can use the OR operator. site: http://news.ycombinator.com OR site:stackoverflow.com I don't know if there's a max # of sites you can add. I tried it with three and it seemed to work great. http://www.google.com/search?q=site:searchengineland.com+OR+... (Yes, I did an ego search. Isn't that the best way to know if the results are likely accurate? :) If there's a set…
I'll have a look at your links, in a minute -- probably should have done that first.
EDIT: Well, your second link sure works. I wonder what I was doing wrong. When I saw someone else('s or s') comments online to the effect that it didn't work, I assumed that was why my own experience failed.
I'm in serious need of some coffee, at the moment. Thanks for correcting my mis-impression; I look forward to straightening it out in my mind and taking advantage of this feature.