Recommendations for a sane denoising filter?

[type1encryption]

I haven't really been following recent development in terms of new denoising filters. From browsing the forums a couple of times I have the feeling it's mostly about filtering HD sources or badly digitalized Anime now.

Are there any decent denoising filters that help compressability without "destroying detail" or altering the source too much?

I got following areas I'd want to cover:

regular SD-DVDs
regular HDTV stuff or BD
gaming clips (youtube.com/type1encryption, see here for a taste, sometimes I didn't denoise, sometimes I denoised with undot, sometimes I added a bit of grain, still didn't find a pleasing enough solution, I assume mostly because of the relatively low res + shitty youtube encoding)

thx guys

[Bloax]

I can definitely say that the in-loop x264 denoiser (--nr) does help, though I haven't really experimented with getting stuff to look good on youtube.

[type1encryption]

I'm very happy with mvdegrain2 now for the third case