Ribon | Ribon is a monthly shoujo manga (girl's comics) magazine published by Shueisha where Aishiteruze Baby runs a chapter at a time. The magazine carries several stories by different authors and runs at about 500 pages per issue. Since it's aimed at younger girls, Ribon generally carries cute stories with colorful artwork (although it doesn't exclude series like Miho Obana's Partner).
All stories are printed in a different color, and they usually have full-size art pages (or spreads) at the beginning. Ribon Montlhy always comes with cute "furoku" (freebies), so you can get stationary, stickers, cards, etc. It also has send-in offers for you to receive presents from selected series.
If you want to subscribe to Ribon, Kinokuniya Bookstores (email the location closest to you) and Sasuga Japanese Bookstore are good places to try (Kinokuniya is less expensive but takes longer to get each issue).