I am away as follows in 2010, probably no email:

Jan 18-19
Jan 29
March 4-21
You may use the following telephone numbers, 
but I recommend email(when I am not away..
then try the mobile if it is urgent). 

Tel+46 8 7907194 (office)
   +46 8 51785491 (home)
   +46 8 54580599 (home)
   +46 8 7701929 (summer)
   +46 70 2441468 (mobile)
Fax+46 8 7900930 (Nada dept fax)
URL:     http://www.nada.kth.se/~stefan
email:   stefan@nada.kth.se (business)

Office Hours: by appointment.

Visiting address:
room 1436
Lindstedtsvagen 3 or Osquars Backe 2, KTH Campus, 
subway station: Tekniska Hogskolan

public mail adress:

Stefan Arnborg, 
KTH CSC TCS 
SE-100 44 Stockholm,
SWEDEN

delivery service address:

Stefan Arnborg, 
Osquars Backe 2, plan 4, room 1436,
KTH, CSC
SE-100 44 Stockholm,
SWEDEN

Home address: Karlavagen 101, SE-115 22, Stockholm, Sweden