rtmpdump has always been in the repository, pretty much since Maemo5's inception. Here's the Debian version of get-flash-videos. It requires rtmpdump. The problem is that the version in the Fremantle repository is very old and works less and less well as time passes because it can't cope with newer media sources.

Having had a quick look at get-flash-videos, it seems quite similar to get_iplayer, which is also a cli rtmpdump client. And, it too is suffering from the ageing version of rtmpdump.

I have just installed Debian (squeeze) on my other HDD so if I can work out how to get scatchbox and other sdk items installed, I'll see what I can do about compiling v2.4 for the N900. Having used M$ "environments" (Office, VS, etc.) for so long it's very weird having to think for oneself. I have to say, so far, the online help is much more instructive than anything I've ever encountered from redmond (both better in the specifics of "do this:" and the whys and wherefores). Anyway - that's another tale! No promises - I'm a linux learner and very new to the penguin way of life!

I'd also vote to upgrade our ffmpeg to the bug-fixed v0.55, over our current v0.5 in order to better trans- or re-en-code (e.g. convert from "Main" to "Baseline" on device) to make content playable.
...but that's another matter!