I have an Orinoco RG1100 and a Linksys BEFW11S4 access points and a single cable modem. Is there some way I can combine the 2 APs to increase my range?
Yes and no
Depending on the model you could set up a wireless bridge:
[cable modem]--------[wireless bridge]) ) ) ) ) [wireless bridge 2]------[computer]
where ---- denotes a hard wire connection and ) ) is the wireless bridge.
There are many possibilities that you could use. Another method would be to run your cable modem to a broadband router and run 2 cables to differnet sections in the house - connect each one to a wireless router - this would give you 2 zones to access the net inside your home.