Information about Yo-Yoing: 
www.tym.de (the Yo-Yo website of the German-speaking community)
www.yoyonation.com (international Yo-Yo forum)

Yo-Yo Shops:
www.yoyonation.co.uk (UK)
www.yoyonation.com (USA)
www.yoyoexpert.com (USA)
www.euro-yo.com (UK)
www.jugglux.ch (CH)
www.yo-yo.de (D)
www.yoyoguy.com (USA)
www.activepeople.com (List of Yo-Yo Shops in Switzerland)

Friends:
www.styling-studio.ch (Make-up-Studio / Stylist)
www.enricobizzarro.com (Hairstyling)
www.cm-art.ch (Dance acrobatics)
www.joysbubble.com (Balloon Twisting / Kid's Parties)
www.body-comedy.ch (Comedy)