Modules that Worry Me
Modules that have a guaranteed Drupal 7 release (or upgrade path):
CCK
Date
External Link
Filefield
Fivestar
Google Analytics
ImageAPI - now in core
Imagecache - now in core
Imagefield
IMCE
JQuery UI
Lightbox2
Link
Markdown
Path Redirect
Rules
String Overrides
Token - now in core
User Protect
Views
VotingAPI
Webform
That's 22 modules - but sadly, that's 22 out of 44. Half.
A few additional modules PROBABLY will have Drupal 7 versions:
Auto Nodetitle
Captcha - if not, we'll just have to move to a different type of validation module
Email
Thickbox
Some modules will probably no longer be necessary:
cache exclude, content profile, menu breadcrumb, wysiwyg filter
If we stop supporting IE 6 (which is less than 2% of our users anyway!), we won't need pngfix
Some modules have functionality that I will really miss but isn't strictly necessary:
computed field (now have rules module)
nodereference url - could just use the default autocomplete fields
tinytinymce - like how configurable and lightweight it is - but we could use an alternative
views attach - could just do this through the theme layer
This leaves me with 9 modules that somewhat worry me.
Content Access - I really, really hope restricting view permissions by content type is incorporated into core in Drupal 7. It should be.
Google CSE - Worse case scenario, I could probably upgrade this myself since it's just an interface for a Google API.
Menu Block & Menutrails - I really hope these both get upgraded or similar functionality is incorporated into core Drupal
Role Delegation - Also hoping this functionality gets included in Drupal 7.
Location - This one haunts me a bit. I had to hack even the Drupal 6 version to get it to work. I should never have offered this functionality to one of our groups, and I won't offer it to any more.
Embedded Gmap - This isn't even definitely going to be incorporated into a site yet, and I may give sites that want this functionality a warning regarding whether the functionality will continue to exist if we upgrade.
Library - This is the worst. Since this is a custom module, I'll need to do the entire upgrade. And with all the changes to Drupal core, I probably will need to rewrite it from scratch and yet keep an upgrade path. *cringe
PDFtoText - not too worried about this one. While it's a custom module, it is really, really simple and most of the functionality is independent of Drupal.