ian_c -> ian_chase
snow_puma -> ian_chase
deliciousorange -> ian_chase
delicious_orange -> ian_chase

Same artist.

han64 -> han_(jackpot)

More proper name.

tongpoo -> tonpuu: とんぷう

yosinoya35 -> sougetsu_(yosinoya35) or sougetsu@

草月 (His/her twitter account is Sougetsu999)

miyata_ao -> miyata_sou
Reason: It's an alternate kanji reading, but the correct name is sou.

kuuru_kyou_shinja <-> cool_kyou_shinja or cool-kyou_shinja

Reason: His twitter account is coolkyousinnjya.

okayado -> inui_takemaru

If the wiki's correct, Inui Takemaru is the artist's real name, while Okayado is a nickname.

Aliasing: risoumaeda -> maeda_risou :前田 理想
Mass editing: tahal -> taharu_kousuke : たはるコウスケ

Aliased:
gogono_panya -> gogono_pan'ya
ian_c -> ian_chase
snow_puma -> ian_chase
deliciousorange -> ian_chase
delicious_orange -> ian_chase
han64 -> han_(jackpot)
tongpoo -> tonpuu
yosinoya35 -> sougetsu_(yosinoya35)
miyata_ao -> miyata_sou
kuuru_kyou_shinja -> cool-kyou_shinja
okayado -> inui_takemaru
risoumaeda -> maeda_risou
tahal -> taharu_kousuke

Just went ahead and aliased the last because tahal isn't likely to be used.

Aliasing or mass editing: rby -> shikihara_mitabi
This artist changed his name to 色原みたび (しきはらみたび).

spidu -> ragathol
Same guy, different aliases.

Aliasing or mass editing: akabashi -> akabashi_yuusuke
His full name is 赤端ゆうすけ.
Aliasing: crimson shake -> beni_shake
His twitter account is BeniShake.

kamo_nari -> kamonari_ahiru
Already moved. This deserves an alias though.
raku_pix -> rakurakutei_ramen
楽々亭 拉麺 (らくらくてい らーめん)

wakino_yoshifumi -> wakino_keibun: Correct name reading is in kana in the artist database.

I uploaded a work of this guy

http://www.pixiv.net/member.php?id=1387218

Can someone help me on naming him? I can't understand moonrunes and I doubt google translate can help me

tsuzuri -> tsuzuri_(itosousou)
itosousou -> tsuzuri_(itosousou)
Reason: Same artist. Both wiki's have his new Pixiv profile linked, though only "itosousou" got the identifying URL. He goes by the hiragana つじり on Nico Nico Seiga, which makes me wonder if 綴り is read "tsujiri" but that doesn't appear to be a valid reading for the kanji.

mount_position -> daizan_(mount_position)
Reason: "Mount Position" is the artist's site name.

bbsacon <-> sako_(bosscoffee)
Alternate name.
http://www.mangaupdates.com/authors.html?id=12332
http://bbsaconneo.sakura.ne.jp/Profile.html

Aliased:
rby -> shikihara_mitabi
spidu -> ragathol
akabashi -> akabashi_yuusuke
crimson_shake -> beni_shake
kamo_nari -> kamonari_ahiru
raku_pix -> rakurakutei_ramen
wakino_yoshifumi -> wakino_keibun
mount_position -> daizan_(mount_position)
bbsacon <-> sako_(bosscoffee)

Moved:
tsuzuri -> tsuzuri_(itosousou)
itosousou -> tsuzuri_(itosousou)

mio_(pixiv183703) -> yuunagi_(seventh_heaven)
Reason: Artist's current name and site.

yuunagi -> suda_(yuunagi_enikki)
Reason: Artist's current name and site; not as ambiguous.