I'm in the process of developing my own system which will allow me to enter flight details, it will then produce reports for total lfight time etc. It will eventually do everything that SkyLog will do, and perhaps more, however the beauty of SkyLog is that it is recognised by the CAA as official documentation (or so it says on the product). If you are any goof with Excel or Access for example, try keeping a log that way if you are not interested in producing lovely looking reports - that way it is still an electronic backup.
Regards
Maz