Right now it is one of the best options for cross-platform development. Kylix is dead (correct me if I am wrong); Lazarus is not ready yet (but it's on the way); Mono is not good enough yet (and is doomed to play catch with Microsoft .NET). Other portable options (Java/GTK/QT/etc) don't have a nice RAD environment like Delphi.
On the other hand, WINE has evolved (in the last years) enough to run most Win32 applications written in Delphi 7 or less. If the developer avoids certain problematic components, it runs 100% fine. Faster than Java, more complete than Mono, easier to code than GTK / QT / whatever. Been there, done that.