Evernote - Useful and advanced notebook software, lots of features, friendly UI. Used to be a desktop program, now a web service.

Online image editor+FF/Vista plugin, useful

You really do not need a desktop imaging software 99% of times.

Одновременное использование нескольких операционых систем при помощи colinux, Virtual PC и утилиты Desktops.

Hadoop Clusters Get A Monitoring Client With Cloudera Desktop by @leenarao

jQuery Desktop.