If you are coming to Macworld, you will be in the heart of San Francisco. Whether you have been here before or not, there are some essential apps you should load on your iPhone for worry-free navigation of the Expo and the city.
Without question, the #1 app you should have is iMacworld. The latest update adds Session info and detailed maps of the Halls, plus an easy to search directory of vendors and products. My only wish is that this app had been around for previous Expos.
For you elbow-rubbing and social networking types, download a copy of Handshake. Handshake will allow you to easily exchange your contact info with other iPhone users without worrying about loosing those pesky business cards that fall to the bottom of your goodie bags.
There are a TON of Starbucks in San Francisco. To log on to get your free iPhone wifi connection from AT&T, download Easy Wi-Fi for AT&T. It costs $0.99, but it is totally worth it for speeding up your connection to hotspots to check your voluminous email, or to download one of the apps you just read about in this article.
If you are combining your Expo trip with your vacation plans, or hope to explore the city a bit, Routesy can provide you with all the local MUNI transit information and schedules. If you don't want to spend the $2.99 for Routesy, there are also two Web 2.0 apps available that you can use with Safari for free.
MUNI Time (sf.munitime.com)
If you are flying into the San Francisco or Oakland airports, and don't plan on renting a car, you will need to take BART (Bay Area Rapid Transit). To get BART schedules and maps of stops, download iBART. There is a BART train that goes directly from SFO to downtown, just blocks from Moscone. Trips from the Oakland airport require a short $3 shuttlebus trip to the BART station before continuing to San Francisco.
The mobile version of Yelp is great at helping to find eateries and night spots in the city during your Macworld stay. The only problem might be that there are too many great spots to visit making it hard to choose. Yelp is especially handy since there aren't a lot of places right around Moscone, and the ones that are will probably be packed with Expo-goers. Wear some comfortable shoes and hike to some of the more out of the way spots.
Finally, if you are looking for something to do outside of the Expo venue, try twiddlerSF which is a great app that can randomly choose a place to go in the city or an event, based on your "mood" and how far you want to travel. It also had a cool spinner interface.