WRT54G wireless network security

I have a WRT54G V.6 that i've been using for several years. Its attached directly to my desktop and wirelessly to 2 laptops in my house. I have as much security as i can have on it...WPA2 with a long password, Mac filtering, password for the router administration etc. Lately i've been getting billed from my interenet for too much downloads and i'm sure it wasn't me thats been downloading. I'm worried someone's been on my network. I enabled logging on the router but i don't understand how to tell if someone's been on my network aside from me and my family. Can someone please tell me how to find out if someone's been on my network, either by looking at the log or some other way? Also, any other suggestions for protecting my network?
thanks
Daniel 

You could check the "DHCP Client Table" and see if there are any MAC addresses listed that don't belong to you.  However, keep in mind that MAC addresses can be faked.
You said that you have a "long password", but just as important, does it contain a variety of characters, such as capital letters, small letters, and digits?    If you are simply using a long dictionary word, WPA2 can be cracked in a few minutes.  Usually I recommend at least 24 random characters for the encryption password, and at least 12 random characters in the router login password, but even half this number will keep out all but the most dedicated intruders.
It is very unlikely that anyone could crack a WPA2 protected system, if you are using a strong password.  But, for your own peace of mind, change your encryption and router login passwords.
More likely, you have a lot more downloading than you realize.  Most people have their computer set for automatice updates.  Microsoft recently put out a 250 megabyte update.  Antivirus programs update themselves frequently.  If anyone in your household is using peer-to-peer (P2P) software, this can result in massive downloads.  If your computer is infected with a virus, the virus could be generating downloads.
Overall, it sounds like your security is pretty good.  For added security, if you do not use UPnP, then, in the router, set it to "disabled".   UPnP is used by some programs, such as Internet games, video conferencing software, etc.  When UPnP is enabled, it allows any program on your computer to open a port and listen for incoming data.   Virus programs will often use this feature to listen for instructions from home, and download data to your computer.  I assume that you routinely run an antivirus program on your computer, if not, then I would suggest this.  Make sure that your antivirus program also checks for "root kits", which is a common method that viruses use to hide on your computer.
Hope this helps.

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