Nanny cam or some way to watch my place while out of town?

I go out of town frequently and have someone watch my house and pets. Sometimes I think they just skip days and don't even do what I'm paying them to do on some days. Do you know of any good cameras that I can since to my iPhone or computer, so I can watch my place while I'm out of town?
A friend recommended a nanny cam, but I just want to make sure I get a good one and an affordable one at that. Any suggestions/recommendations would be much appreciated, thanks.

IP cameras, they are available cheaply on ebay