I travelled to Morocco with my Google Nexus tablet, which I love, but it does have its quirks! I use it for all my travel docs, programmes, timetables, books and music, as well as keeping in touch via email and browsing the web. Using it as a reader was the best thing, as I read a lot on holidays and it meant I could just about give hard copy books a miss - did sneak one or two in, though.
In an attempt to travel lighter, I've abandoned my Bose noise cancelling headphones, and use Sony noise cancelling ear buds, which are almost as good, weigh nothing, and take up no space. I have an iPod for music, especially on the plane, and an unlocked phone - for local SIM.
I have a digital SLR camera which weighs a bit, but the pictures are better than the phone. A friend has a wonderful new compact camera which I may investigate for next trip.
When we were in Italy, the GPS was wonderful, but I don't usually take it. I have no use for alarm clocks - I wake up naturally early.