9 toolbox - free at the moment. Very good currancy converter & other converters etc.
Ingredient Converter - 59p I think - excellent & invaluable, if like me you have a fair few American cook books with everything in 'cups' etc. Been waiting for something like this for years!
Here I Am - Free (the red logo'd one - there are 2 apps of the same name)
GPS finder that then allows you to send an email with a google maps link embedded.
SBB Timetable - Free. Swiss railways timetable covering & linking literally every last Train, Tram, Bus & Boat in the country.
Most impressive public transport app I've seen so far IMO. Works flawlessly.
FM4 live stream - Free.
FM4 is a great English language Austrian terrestrial radio station (think, what XFM should be) - this is their live stream. Even works very well in the car if 3G's good.