Ipod touch 2g apps gone?

[Macks]

Hi guys, Well i got an ipod touch earlier today.. downloaded around 5-6 apps, one which i payed like £1.29 for.. I plugged the ipod into my computer for it to charge and next thing i know i have no applications left? Im not sure whats gone on and i cant seem to find them anywhere. I know £1.29 isnt anything but i dont want this to happen again once i decide to start buying more and more aplications.. does anyone know whats going on?

[Stretch]

SIgn into your iTunes account on your computer, and you might have to redownload them. I'm guessing you weren't signed into your itunes account when you synced your ipod.