Hi

We have a wireless lan running whit ospf.

As long that any customer doesn't want their own public ip they will show our public. But, when a customer asks for a public ip, whats the easiest way to route it out the customer?

At the client site we leave a 750 router. Mayby I should connect a pppoe to our router over the wlan and serve the public ip that way?

We have about 60 public addresses that we can offer.

How should i do?

You just - route it. Whether you route it across a PPPoE connection (which automatically inserts a route for the /32 on the client into the routing table of the PPPoE server, or have a /30 network between your router and the customer's and route more IPs across it (or keep it just as the /30) is up to you. There's no "better" method. Do what works for you, and fits your deployment style.