Thanks. Please keep the suggestions coming!
Sadly I've run KotB and Cult of the Reptile God recently for the some of the guys in the group.
Sorry, even though I gave some recommendations yesterday, I didn't re-read your request before posting this morning. What follows is all 3ed recommendations - not what you were looking for. I'll leave them just in case you are willing to do the conversions, but if not, feel free to ignore. That should teach me to review the thread before posting - dumba@@
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I misunderstood that by introductory that you meant an adventure suitable for first time players, but if you are a more experienced group and are just looking for a good first level adventure, you probably have a few more options:
We liked Crucible of Freya from Necromancer Games LVL1-3 - had some interesting town/open wilderness adventuring as well as a castle crawl; Barrow of the Forgotten King was an interesting crypt crawl, supposedly for levels 2+ but if the group is careful they could start at 1.
Have you tried any of the adventure paths? Even if you don't do the whole thing, some have interesting first adventures. There is nothing wrong with starting and then dropping out - just don't use all the adventure hooks to carry through. I never played it, but EN World's War of the Burning Sky's first adventure looked pretty cool (town under siege - link up and help the resistance). Paizo has some very popular adventure paths as well.