PDF Label Creater RPT / Crystal Report Templates

We need a Windows Service / program developing that can create PDF documents from metadata and document tamplates. 1) The program / service needs to run continuously on a Windows Server 2008 machine waiting for metadata to be received. 2) The metadata can be delivered by text file or via a web-service / xml (if so the web-service needs to be created as part of this project). 3) The metadata will contain all the content that is required to produce the labels. 4) The metadata will specify a label template to use. The service should support multiple templates. 5) The service should be able to accept templates in crystal reports / rpt format or a suitable alternative. 6) The service should allow additional templates to be easily added. 7) The service must support the use of barcodes. It can use the free3of9 font or a suitable alternative. 8) The service should save the PDFs to a path specified in the metadata. 9) The service should support creating PDFs in different page sizes (A4, A5, 4inch x 4inch etc). 10) 6 initial templates / labels should be created as part of this project. 11) We do not want to purchase any PDF generation software so free / open source tools like PDFSharp should be used. I am open to suggestions about which language to develop this in. All source code should be delivered as part of the project.