Elvis Presley was five years old at the time of the 1940 census.

Given that the census far predated Facebook, Twitter and Girls Around Me, this is some of the only public information available online about many people who lived in the U.S. at the time.

Some of you who have a bit of spare time this weekend may want to load up the archives and look for relatives. U.S. residents who live in older houses can check to see who the former occupants were.

It really helps if you know a street address, and the ultimate reward is not terrifically dynamic: it’s just a picture of a handwritten list of names and demographic and occupational details.

Over time, this will get better-digitized and more searchable through indexing projects by various sites. For example, you can already search by name for residents of Bristol County, R.I., on the MyHeritage site. Once the massive dataset is organized, there will surely be all sorts of interesting analysis to be had.

But, for today, you can also play voyeur and look for celebrities — or just check out some of those already found, like Betty White, Johnny Cash, Chuck Norris (then Carlos Ray Norris), J.D. Salinger (Jerome Salinger), Elvis Presley and Albert Einstein. There’s an actively maintained Twitter account for the census put up by Archives.com that rounds up lots of good finds here.

With Macworld out of the way (basic verdict: Phil Schiller did not bomb), a chunk of the crack All Things Digital squad is now winging its way both east and west to the annual gadgetopocalypse in Las Vegas, a.k.a. the Consumer Electronics Show.

Despite the fact that the show is feeling the pinch of the economy–I was able to get a better room at a cheaper price last night, which was unheard of in the past–and that there are really no big products to speak of, except perhaps the new Palm (PALM) smartphone, CES is still one of the biggest and most important gatherings of the tech year.

Las Vegas turns into a geek moshpit every year–with the spicier pornies thrown in, with that industry’s convention also taking place at the same time–as legions of vendors, buyers, press and others converge to be overwhelmed for days by noise, long lines for cabs, keynotes, demos and more.

That also means the ATD team, including: Walt Mossberg, who gets the kind of attention from techies at CES normally reserved for Brangelina; Mossberg Solution columnist Katherine Boehret, who trolls the convention center floor looking for cool new products; MediaMemo’s Peter Kafka, who has scheduled himself to the gills; and me, who has not.

Still, there will be parties thrown by Facebook, CBS (CBS) and more to attend, a cornucopia of gadgetry to try and panels to moderate (I am manning one supersession called, I kid you not: “What Will They Think of Next? Consumer Technology in 2025″).

Also, I’ll be honest, gambling at the Pussycat Dolls Lounge with a passel of nerds.

Between the hands of poker, look for our ongoing coverage over the next few days, including interviews, videos and news (we hope!).

It will all begin tonight with coverage of Microsoft CEO Steve Ballmer’s preshow opening keynote, taking over from longtime first-nighter Bill Gates.

Until then, here is the fabulous Ann-Margret doing a mean bugaloo in “Viva Las Vegas” (the Pussycat Dolls have nothing on her) with super-handsome-phase Elvis Presley singing like a dream: