I thought I give Zoho Invoice a testdrive right after breakfast. I was looking for such a service for a long long time. There are of course desktop apps – like iRatchet (for Mac) – out as well as server based like Simpleinvoices. But none of those share the ease of customization, the feature richness, and the simplicity with Zoho Invoice. The server is a little slow right now – that’s the only drawback I’d say.
For a small firm this app is perfect – as long as you can live with the fact that your data resides not on your premises.
[Update:] Exporting and printing is shit.