ADRIAN L. D. SAMPSON  Finally, a usable invoicing application. This application is full-featured but does not sacrifice polish or intuitiveness. The interface reflects its straightforward operation that integrates line-items with timed tasks and makes printing attractive invoices mindlessly simple.

Like most such applications, On The Job includes a task timer; the idle warning (if you stop working but forget to stop your timer) is a godsend. This software does exactly what I, at least, need in an organized, logical way.  
(Version 2.2.1)

ADRIAN L. D. SAMPSON  Scalp allows iCalendar files (with the .ics extension) to be published, just as iCal's built-in publishing feature does.  
(Version 0.1)

ADRIAN L. D. SAMPSON  There are about ten million freelancing time-tabulator apps out there, but I can say that this is the only one I haven't eventually gotten frustrated with. Its interface is simple and direct; the menu bar item is a great convenience; the idle timer is a godsend.

No invoicing and no exporting, but it gets the job done and gets out of my way.  
(Version 1.0)

ADRIAN L. D. SAMPSON  Not to derogate this program, but I have to agree with the previous two posters that LotsaWater just looks more realistic -- and is more entertaining -- than this saver.   
(Version 1.0.5)

ADRIAN L. D. SAMPSON  Since Notational Velocity, which has its own slew of frustrating limitations, this is the only note-taking software I've been able to use comfortably for more than five minutes. Full-featured, stable, and, above all, transparent. Notae finally gets it right at a downright reasonable price.  
(Version 1.0)