How to make screenshot/jpg/pdf of ENTIRE long Safari window (not just visible part)?

I want to get a "screenshot" (i.e. an image in any format -- PNG, JPG, PDF, whatever) of a looooooooong Safari window diplaying a Web page that entends far below the bottom of the visible screen area and has to be scrolled down to see all of it.

I know about the standard screenshot keyboard tricks in 10.6 -- Command-shift-4, Command-shift-4 then spacebar/click, Command-shift-3, etc. But not any of them allow the user to get a screen shot of the entirety of a long/deep window -- they only capture what is visible on the screen.

Also, another trick people often mention is to "print" (command-P) the Safari page, but instead of sending it to a printer choose "Save as PDF." Brilliant -- except that for some reason I've never been able to "print" a Safari page -- as soon as I hit the command-P keystrokes in Safari, I immediately get a spinning beachball that will only go a way with a force-quit of Safari. This has always been true on this computer (MacBook Pro) -- not sure if it's a common bug or if it's just an eccentricity of my particular machine. Either way, that option is off the table because "printing" is impossible with my Safari.

I also searched around for various third-party freeware applications, and despite a lot of grandiose promises, none of them actually was able to capture an entire window including portions not currently visible on the screen.

I did find a commercial application called SnapWeb that does have the capability to do exactly what I want -- but it doesn't produce usable images in demo mode and requires $$$ to unlock and work properly, something I'm currently unwilling to pay for a simple one-use gimmick that simply must be part of the OS already.

So my question is:

Is there any native way within the 10.6 OS that allows users to capture an entire long Safari window as an image file (not as a Web Archive, but as an image file composed of pixels), which includes the entirety of a Web page no matter how "long" it is, even if it extends far below the visible screen footprint?

And if there is no native way in 10.6, if there a freeware/shareware application/widget/plugin/whatever which does the same thing?

I already know about a commercial software that does it (SnapWeb), so I don't need more recommendations for paid apps. And I know that I can laboriously construct a JPEG by hand with Photoshop by taking a screenshot of the visible window, scrolling down a little, taking another screenshot, etc. etc., and then
"stitching" them together. Yeah, it's possible (and in fact is what I've done in the past), but it's a time-consuming hassle that shouldn't be necessary.

Help! I've wondered about how to do this for years, and have never yet found a satisfactory answer.