Copied and revised from another bbs:
Musume and Company:
Singles: all EXCEPT Ai no Tane & Hyokkori Hyotanjima. Only double dip (first-pressing box and "regular" release) I took was "Joshi Kashimashi."
Albums: all, including regular and special editions of "Second Morning." I also got "Best 1" on vinyl, thinking it would be worth something in the future. All the Pucchi Best/Together collections. And the Early Single Box.
Videos: all PV clip DVDs, including Gambacchae/Hey! Mirai! EXCEPT for "Hyokkori Hyotanjima."
Concerts: First Live and Memory Seishun concerts on laserdisc (yes, LASER-DISC). Budokan, Green Live (ecch!), Live Revolution and Love Is Alive on DVD. I quit buying concerts cause it just isn't the same without a live band.
Albums: all (well, both)
Videos: Just that one DVD, I guess
same as Tanpopo, everything.
Minimoni (well, not everything):
Videos: Jankenpyon, Telephone, Hinamatsuri, Genki/Okashi DVDs
Singles: "Junjyou Koushinkyoku."
Singles: Ai no Bakayaro
Albums: Makking Gold 1
Videos: Clips 1 DVD
only the "Ne~e" first edition CD single.
DVD: First and Second PV clips; Your Song, Watarasebashi, Zutto Suki de Iidesuka.
"Romantic Ukare Mode" single
MIKI (1) album (first pressing box)
All PV DVDs.
CD: The one with Salt 5, 11 Water, 20 Dirt or whatever. The one that had the awesome hardcover book.
H.P. All Stars. HAD to get that one.
DVD: All the DVD releases.
Morning Cop (also purchased the VHS)
Pinch Runner: both the movie and making-of DVDs
All the "Idol wo Sagase" volumes
Hello Project Live 2002.
"Hajimete no Happy Birthday" CD -- Country Rika.
"Jinsei ga mou Hajimatteru" CD -- Cubic Cross.
"Folk Days" concert DVD with Sayaka and Yuko. One of the great underrated videos related to Hello Project.
Boo Takagi Hawaiian Medley DVD. A gift.
"22sai no Watashi" -- CD and DVD.
Takahashi Ai Alo-Hello DVD
2001 Fan Club CD singles -- bought via auction and includes my number-one favorite H!P-related song, Rikaishite! Onnanoko.
2003 Sweet Morning Box -- a gift.
First one (with gen-1 as fresh-faced idols)
Second one (the red cover)
Chain! Chain! Chain!
5th Anniversary Photo Book (the Up To Boy release)
First one ("Rika Ishikawa")
Second one ("Ishikawa Rika Shashinshuu")
Last one ("hana-bi")
Nacchi 1st ("Nacchi")
Marippe 1st ("yaguchi")
Sayaka 1st ("self")
What else? Various trading cards, a few official photos/stickers (from H!P stores in Harajuku and here in Hawaii), a few Musume pencils (I have an Aibon pencil at work), a Mikitty keitai strap, and every official Musume calendar since 1999.