One of the small problems that people have mentioned regarding the Samsung Galaxy S II is the lack of a notification LED. This does seem a rather bizarre exclusion by Samsung – if you don’t notice a message when it was first received, there is no notification light to tell you that it is there. The same goes for missed calls, emails, etc. and you therefore need to toggle the standby to check for messages and the rest.
Having had a look into the problem today I have come across an app called NoLED via the XDA Developers Forum. Originally developed for the Samsung Galaxy S which also lacked a notification LED, NoLED displays a notification dot on your homescreen to make you aware of a variety of notifications. It gives you plenty of customization options and also the ability to display the time. At this stage I’m not sure how heavy it will be on battery life – essentially the screen is powered up to display the notification dot – so once you do notice a notification it may be wise to lock the screen again to save on battery. I’ll update this post if I do find the battery to suffer when using the app, if you’ve used it let us know in the comments.