Saites
LU
University of Latvia 
LZA
Latvian Academy of Science
LZP
Latvian Council of Science
IZM
Ministry of Education and Science, Republic of Latvia
EC FP6
European Comission Framework Programme 6 (Latvian site)
SPIE/BALTIC
Baltic Chapter of SPIE
Latvian SuperCluster - LASC
Latvian SuperCluster - LASC
TOP
IZM Innovation (TOP)
TSI
Transport and Telecommunications Institute
Tools, tips and links for physics
Look at The Internet Pilot to Physics (TIPTOP): the best starting point for Physics on Internet. It includes a complete list of Departments, Journals, Conferences, Jobs, second-hand instruments, Schools, as well as Physical Laws, Constants, Data and Tables, and much more. 
E-preprint archives
Look at http://xxx.lanl.gov/ preprint archive: the best up-to-date collection of preprints in Physics.Also the American Physical Society has its own APS E-print server.
European Physical Society
EurophysNet is a physics information and service network organized by the European Physical Society's Internet Coordination Group.
American Physical Society
The homepage of APS contains links to Research Journals (including Phys. Rev. and Phys. Rev. Lett. online journals), Physical Review Focus and much more.
European Community
The European Community Research and Development Information Service is an initiative of the Directorate General XIII/D-2 of the European Community to privide the WWW with information on the research activities of the EU. It provides files with information packages, call for proposals, application forms, for each project (Esprit, Brite/Euram, Biomed, etc.).
ESRF
European Synchrotron Radiation Facility, at Grenoble
CERN
The European Laboratory for Particle Physics, at Geneva
HEPIC
High Energy Physics Information Center
PhysNet
Physics Departments Network
IOP
The Institute of Physics
Elsevier Science
Elsevier Science