At least it was yesterday, when the LA Times checked in on Flickr’s stats; at the time, Apple (AAPL)’s handset had passed the Canon (CAJ) EOS Digital Rebel XTi as the most popular camera on Yahoo’s (YHOO) photo site. The stats are updated daily, though, and as of this afternoon, the Canon had pulled back in front by a few hundred users.

But the precise numbers don’t matter. The takeaway here is that people who like taking and sharing photos are happy to use an inferior camera–even the newest iPhone sports just three megapixels and lacks rudimentary features like zoom and flash–if it’s easy to use. And most important, if it’s already on the phone they’re carrying around.

I’m not the first to point this out, but I’ll reiterate: There are important/worrisome lessons here for other gadget makers.

Cisco’s (CSCO)’s Flip camera line, for instance, is great, and I used my Mino HD twice today for interviews. But if I was carrying around an iPhone 3GS or any other handset with video-recording capabilities, I’m not sure that I would have packed the Flip. And I’d probably end up filming a lot more interviews if my camera was always with me.

Same goes for Amazon’s (AMZN) Kindle, or any other would-be e-book reader: I appreciate that they’re designed specifically for reading and boast low-power screens that are easy on the eyes, hold up well in variable light, etc. But I read a newsstand’s worth of copy every day on my rudimentary BlackBerrry 8830, which isn’t designed for that at all; plenty of iPhone fans say they’re happy reading full-length novels on their gadgets.

That doesn’t mean that people who are passionate about cameras or novels or whatever won’t prefer specialized devices. But that leaves a very big chunk of the market–those of us who find that good enough is plenty good–for the iPhone or any other all-in-one tool.

[Image credit: Erik Pitti]

And there are lots of marketers trying their best to ignore technology and keep their ads as dumb as possible. Example: Sprint’s email to me this morning trying to convince me to sign a new contract so I can snag a free “Katana Eclipse X” from Sanyo. Here’s the pitch (click to enlarge):

Nothing against the Katana Eclipse X, by the way. I’m sure it’s a fine phone. But here’s the thing: Sprint (S) has my email address because I am a customer. I’ve been one for a decade. And so Sprint knows that:

• I own a BlackBerry 8830, and that…
• I spend $100 a month for an all-you-can eat plan (plus another $60 a month for a broadband wireless card!), and that…
• My contract expires in a couple of weeks.

So if I were Sprint, I’d be trying very hard to convince me not to ditch the company for AT&T (T) and Apple’s (AAPL) new iPhone 3G S, which looks awesome.

And again, nothing against the Katana, which is apparently available in “Nightlife Black and Hypnotic Pink.” But it’s no BlackBerry, and it’s no iPhone. And it’s not a Pre, the phone that Sprint and Palm (PALM) are positioning  to compete against those two.

But I’ve yet to get an email from Sprint telling me that the Pre exists–perhaps the company hopes that I’ll be wowed by its new woman-friendly TV ads. Or what about Research in Motion’s (RIMM) new “Tour,” which is coming out this summer and looks great? Nope. Had to learn about that one by reading a blog.

So while I worry that I’ll regret typing this, here goes: Dear Sprint: You know where I live, what I own and how much I spend. You know I’m a free agent at the end of the month. Want to keep me? Start pitching.