Tip: How to cut a cake in half for layering

Was thinking about making a layer cake this weekend. I don't really know how to split a cake in half so I google-ed and came upon this SITE. Clever idea. Will definitely try this out.

Temperature Convertions for Baking

Gas Mark	Fahrenheit	Celsius	Description
1/4	225	110	Very cool/very slow
1/2	250	130	---
1	275	140	cool
2	300	150	---
3	325	170	very moderate
4	350	180	moderate
5	375	190	---
6	400	200	moderately hot
7	425	220	hot
8	450	230	---
9	475	240	very hot

More converstion help here.