Taverna is an application designed to facilitate the integration and use of molecular biology tools and databases available on the web, particularly web services. It enables bioinformaticians to construct workflows or pipelines of services for performing various analyses, such as sequence analysis and genome annotation. These workflows can integrate multiple resources into a single analysis, making it easier to perform complex tasks. Taverna is available under the GNU Lesser General Public License (LGPL) and can access a wide range of services, including those from INSDC, EMBL-EBI, NCBI, DDBJ, PDBJ, KEGG, BioMART, PathPort/ToolBus, BioMOBY, BIND, SeqVista, and Pfam. The application supports the integration of tools from different programming languages and platforms, reducing the need for screen-scraping and manual data transfer. However, it also addresses limitations such as poor metadata, compatibility issues, and unreliable performance of web services. Taverna has been used in various research areas, including functional genomics, metabolic and signaling pathway analysis, and chemoinformatics. The current version, 1.x, has been downloaded around 14,000 times and has an estimated user base of 1,500 installations. Future developments, including version 2.0, aim to enhance features such as higher-throughput workflows, semantic registry, provenance gathering, and enhanced results browsing.Taverna is an application designed to facilitate the integration and use of molecular biology tools and databases available on the web, particularly web services. It enables bioinformaticians to construct workflows or pipelines of services for performing various analyses, such as sequence analysis and genome annotation. These workflows can integrate multiple resources into a single analysis, making it easier to perform complex tasks. Taverna is available under the GNU Lesser General Public License (LGPL) and can access a wide range of services, including those from INSDC, EMBL-EBI, NCBI, DDBJ, PDBJ, KEGG, BioMART, PathPort/ToolBus, BioMOBY, BIND, SeqVista, and Pfam. The application supports the integration of tools from different programming languages and platforms, reducing the need for screen-scraping and manual data transfer. However, it also addresses limitations such as poor metadata, compatibility issues, and unreliable performance of web services. Taverna has been used in various research areas, including functional genomics, metabolic and signaling pathway analysis, and chemoinformatics. The current version, 1.x, has been downloaded around 14,000 times and has an estimated user base of 1,500 installations. Future developments, including version 2.0, aim to enhance features such as higher-throughput workflows, semantic registry, provenance gathering, and enhanced results browsing.