Yep, I've seen it before. On the disc are Tsunku's versions of the "LOVE" songs.
Recently, he redid the "LOVE since 1999" with Ai Takahashi (which IMO sounds better than the duet he had with Ayu)

the CD is called Love ~dekiatte~.

oooh ^^ did they do the duet on Ayuready?

Yap! go to CDjapan.co.jp.. and search artist by the name Tsunku, and there you can find Love ~since 1999~ Cd single.

Is that really Ayu on the cover? IMO she doesn't look like she usually did in those days, somehow.

I've seen this, too. I agree with DevilAyu, his duet with Ai Takahashi was better.