For securing valuables while on the road, have a look at PacSafe:
http://www.pacsafe.com/
Most of their gear is available from your usual local travel gear stores - although I ended up buying most of my gear from
http://www.gogogear.com.au/
For our recent 6 week backpacking trip to South America we bought:
TravelSafe 100 - ideal for passports, spare cash, travel documents, mp3 players, etc ... chained to something solid in the room when we went out.
DaySafe 100 - great travel day pack - slashproof and tamper-proof zippers and acts as a secure storage container if you decide to go out without it - chain it to something solid in the room. Alternatively, remove the secure storage container and take the day pack on its own (for carrying non-valuable items). Large enough to fit a 15" Laptop plus a Canon 40D DSLR with three lenses - and very comfortable to carry as a day-pack (provided you don't carry 10kg of gear in it like I did - my main backpack with all my clothing and other gear was only 17kg
)
MetroSafe 200 - fantastic shoulder bag - large enough for a small travel guide and maps, 600ml bottle of water, compact umbrella, wallets, passports, mobile phones and a compact digital camera! Adjustable strap meant that either my wife or I could carry it. Slashproof and tamper-proof zippers. This never left our side - if we only took one bag when we went out, it was this one.
ProSafe 310 - mini combination lock is great for all those bags you want to lock - compact, lightweight and sturdy. We ended up buying 6 of these and were very happy with them. Weight was important to us since we were backpacking - most locks are much heavier, and the smaller ones seem too flimsy. Note - not TSA approved, so not recommended for flights to/from the US.
As for technology - most tri-band GSM phones will work in Europe (you may need to contact your carrier to enable global roaming). Watch out for costs though - you will pay for inbound calls as well as outbound and costs increase rapidly. Voicemail can also be problematic - make sure you research this and set stuff up BEFORE you leave the country (too late once you're gone).
WiFi is pretty easy to get in most locations these days - especially tourist spots. We stayed in backpacker hostels in South America and I deliberately booked places which advertised free WiFi - ironically only had trouble in the larger cities - everywhere else worked without problems. Just for reference - Santiago airport has some of the fastest free WiFi around !!!
VoIP is a great alternative to expensive mobile phone calls.