Papers:

• CiteSeer Digital Library
• Elsevier Science Direct
• arXiv.org e-Print archive
• The Collection of Computer Science Bibliographies

Computational Linguistics:

• Computational Linguistics in the Netherlands (CLIN)
• The Association for Computational Linguistics
• SIGNLL (ACL's Special Interest Group on Natural Language Learning)

Travel:

• OV Reisplanner (public transport in the NLs)
• Bahn.DE planner (the best European-wide railway transport planner)