For tracking sales and producing/maintaining invoices properly, a custom webapp (which also takes and reconciles payments for said sales). For "book keeping" ev

For tracking sales and producing/maintaining invoices properly, a custom webapp (which also takes and reconciles payments for said sales). For "book keeping" everything together (sales, expenses, payroll, etc.) to give to the accountant at year end, Excel(!) Why? We're a UK business that mostly deals in USD and after spending quite some time researching 3 years ago, we couldn't find anything Web-based that could deal with all of the technicalities of multi-currency accounts, strict VAT invoice specs (particularly involving alternative currencies), and arcane VAT rules (reverse charging, EU sales lists, digital content sales, etc.) I believe there are a couple of systems that'll do it all now but we'd already developed our stuff before they caught up..