Forum roundup: A hot topic in the MacNN forums today revolves around a discussion about the differences between the MacBook Air and the Dell Inspiron Mini 9 notebooks. One forum goer is looking for a novel writing application and finds some suggestions from others. Mac Elite, iomatic, is looking for an iPhone hiking application that would be able to provide proper navigation in generally uncharted areas. A deal on a 2TB AcomData external hard drive is the topic of conversation in this thread. Advice on where to find a new Ethernet card for a Power Mac G3 can be found here.