Peavey and Agile Partners have just introduced AmpKit and AmpKit LiNK, an iPhone-based hardware/app combo that takes portable guitar and bass effects to a new level. It's loud, it's lightweight, and it's an extremely flexible (and relatively inexpensive) alternative to a floor full of pedals.
Matt Tinsley recently reviewed the iRig and AmpliTube combination that also became available recently. I pre-ordered the iRig, and I loved it from the moment I got it in the mail and plugged my guitar
