I've got to admit that I find Excel one of the best applications on my PC.  Many people I work with use it solely as a glorified calculator (my boss has been seen to actually type the numbers into the cells, then use a desk calculator to add up the numbers!).

In addition to selecting random tracks to play (see "I've been doing this for years") I find myself using the program almost everyday.  The new version on Office XP Pro has an excellent help function - I usually spurn all offers of help that animated paperclips etc. try to provide, but this facility is helpful in that you type what you want to do and it will try to guide you to the correct function.

I started off in my first job using Lotus 1-2-3 and begun to get hooked on spreadsheets there.  The ability to produce pie charts, line graphs and bar charts should never be underestimated.  I've kept a track of every lottery number drawn and have graphs to show the distribution of numbers.  Using the information gathered from the graphs has netted me an impressive £10! 

Through university I was able to track my spending down to the last penny and find out that I spent more on alcohol and takeaways than on books and stationery - a fact I would never have known without a spreadsheet!

My latest function find has been CONCATENATE - putting the contents of 2 cells together into a single cell.