Samsung Moment :: Can't Download Anything From The Market

I recently upgraded to a rooted 2.1 system and all worked well for about a week, including use of the Market. But now I can't download anything from the Market at this point. I've tried every solution I've seen on this and other forums, but nothing has solved the issue. I've tried rebooting through recovery, pulling out the battery, starting Google Talk (apparently that helps with other phones), checked the 'okay to download third-party apps/unknown sources' mark in settings, and cleared the cache out of every application. I've uninstalled every application I've downloaded in the last 3-4 days.

However, I can't find the Market app to clear the cache - would seem like if I cleared the cache from the Market app, that might do the trick. I remember seeing it as an manageable app in 1.5, but it's not showing in 2.1.

Is the Market app in 2.1 hidden somehow? I've used Root Explorer, ASTRO and the stock apps manager but none show the Market program as an application.

Also, are there other suggestions I haven't tried?

The reason it's an issue right now is because I removed the mms.apk program (moved it to the SD card, but it won't re-install -- tried ASTRO and Root Explorer) and was using Handsent SMS exclusively for texting. But Handsent had some problems so I uninstalled it and was about to re-install it but now I can't successfully download anything from the Market. So, I have no texting ability right now.