Some sites that I would like to to share with you:

In English:
Slashdot - News for nerds, stuff that matters. Just as they say.
Hacker News - Business, startup, developer and technolgy news.
The Economist - Economy in depth, with proper analysis.
TED - Ideas worth spreading.
Real-Time Economy - Technology related community.
Zen Habits - Simplify your routines, life and work.
Security Now - Talk show, computer & network security news and discussion.
Electronic Frontier Finland - personal privacy, freedom of speech and user rights in copyright law.

In Finnish:
Kohti taloudellista riippumattomuutta - About reaching economic independence and investing in general.
Valistunut sijoittaja - All about investing, forums and articles etc.
Vehmas Assembly - Blog about relaxed Life style, quite similar to Zen Habits.
Sytyke Ry - Much information about project co-ordination, system design, etc.

Other handy tools:
7-Zip - Free ultimate compression.
Robtex - Great way to lookup networking info.
Just Ping - Ping your system globally, good check for multihomed/anycast systems.
Ubuntu - Very nice free operating system.
LibreOffice - Ultimate free office software package.
Google - Gmail, Maps, Docs, Sites, Analytics, Adwords etc.
Ampparit - Finnish news aggregator.
KeePass - Ultimate secure password application.
TrashMail - Disposable email addresses with optional challenge response.
Python - Excellent too for data manipulation, scripting, gluing components together.

More personally related sites:

Off The Record Messaging - Send self destructing, read once, encrypted messages, without additional software or keys.
9ox.net - Yet another URL shortener, with guaranteed really short url.
Oy Winpos Ab - My current employer Winpos kassajärjestelmät. (in finnish, in english)
Pertti Lehtinen - My dad's personal site.
Sami Lehtinen - My own home site.

Last update: 2011-12-05 (YYYY-MM-DD) - Copyright Sami Lehtinen - www.sami-lehtinen.net