Several points to clear up...
A few things need to be settled.
Firstly, there's acres of comments like this:
"They are still broadcasting this stuff, sans DRM, in a [relatively] high quality format.
"You could always watch it on a televisual decoding device. Or, record it on a video capturator thingy and convert it yourself. Or ask Smithers to do it, if it's too technical.
"It is amazing the lengths some will go to to get a poor quality version of something they already have. This is only out-amazed by the whining of those that already have something and can't get a poor quality version of it."
Surely the point is to use iPlayer if you miss something, rather than to replace all your TV viewing with it? I distinctly remember David Attenborough saying, "If you missed the last episode of Life In Cold Blood, you can watch it now on BBC iPlayer." Not, "Why not watch this on iPlayer, Freetard?"
So YES! The BBC broadcasts in glorious SD and dabbles in HD, and yes, you can set your generic PVR to record things. You can also drive a Reliant Robin on a motorcycle licence - it's literally THAT relevant to what's being discussed here.
Another thing - there's this idea that by supplying a Flash stream, Linux is catered for. Tell that to anyone using a non-x86 distro, like people with AMD64 processors, or Linux on PPC, or on a GP2X. It's merely catering for anyone Adobe has decided to supply a Flash9 player for.
Finally, Linux downloadable iPlayer - it's not in the pipeline. There's no programmers assigned to it, there's just a vague commitment to consider doing it for a 'niche' operating system once some niche products that are easier to monetise are catered for instead.