I would like quotes to develop a link exchange directory similar in functionality to linkmarket.net. It will be written in asp.net using VB and will have a sql server express back end. The site should allow free and paid member options and should have a paid monthly advertising option just like linkmarket.net. The free member option will only allow a limited number of link exchanges per day, while the paid member option will allow unlimited link exchange requests. The system will incoroptate a searchable directory of registered sites which will be categorised. The system should enable the creation of nested categories within the directory. Members will be able to browse the directory and select sites they wish to exchange links with, the system should then notify the site owners in their members area and by e-mail that they have a link exchange request. The system should allow the member to accept or reject the link exchange. If they accept the link the system should then notify the originator of the request that the link has been accepted and that they should include the link details on their own links page. The system should check both sites to ensure the links have been listed. The paid members site should provide a list of all links exchanged and should provide a status indicator of the links, ie. pending, successfully exchanged etc. and should provide the facilit to check the links to make sure they ares still valid on the sites where they are listed. Payments for membership and advertising will be processed through PayPal.