BlazeFtp is a multiple-session and cache-enabled ftp client with offline searching capability. It's slim, easy to use and powerful. You can learn to use it in several minutes. BlazeFtp also has many special features making esp. convenient to be used by webmasters.

BlazeFtp Features
Multiple session interface based on multiple transfer threads.
Remote directory structure and file listing locally cached.
Lightning-fast offline searching on multiple ftp sites with support of regular expression.
Hierarchical transfer job definition, management and access
Miscellaneous shortcuts to connect to a ftp site.
Uniform integration of local file copy, uploading, downloading and site-to-site transfer.
Persistent and smart transfer engine.
Intelligent file type recognition based on both extension matching and content examination.