Both the 18-55 and 75-300 come in different flavours. The 18-55 which is packaged with the 1000D is indeed an IS lens, but the 75-300 that some retailers offer cheaply when you purchase a 1000D does not have IS or USM (it is the cheapest version of the telephoto lens)
It's an alright telephoto though if you understand it's limitations. You absolutely need to have a shutter speed of 1/focal length or greater, which requires a lot of lighting, and it is a bit soft above 225/250mm zoom. If you go into the purchase knowing that, it's not such a bad lens.
If you're looking for a cheap telephoto to add into your lineup, I highly suggest the Canon 55-250 IS telephoto for your first one. It's extremely sharp and has a great IS system, and should last you until you purchase a 75-300IS+USM or 70-200L lens(Should you choose to purchase a higher end telephoto)





