These may be old news to many of you, but here are some of my latest favorites from free/cheap internet and mobile apps...
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Evernote
Excellent productivity tool, which works perfectly for work and also for my music writing.
Drop.io
Excellent resource for sending bigger files over the internet. Also perfect for my music hobby, sending songs and videos etc.
Plants Vs. Zombies
The best iPhone / iPod Touch game I have come across. Fun and extremely addictive. You can also play this for free with your desktop computer at Popcap's site.
Sumopaint
Awesome browser based "Photoshop-clone".
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Check these out if you have not already:-)