This style for Google Calendar removes the nowrap restriction on event titles in the multi-week and Month views (and the all-day tray in week view for now, too--might change that(?)) to allow the full title to display. (Clearly, you don't want too many long titles on the same day if you don't have the cell space--but that's up to you :D.) Works with all-day and timed events; doesn't work for 'Print', though--haven't looked at that yet.

Also, if you use Greasemonkey, then you can use a script at userscripts.org: GCalendar Tooltiper (http://userscripts.org/scripts/show/27678) [which no longer works--unless the author fixes it, but you can get it working again--differently--by making the change I specify here: http://userscripts.org/topics/56591].

>>>> NOTE: Google Calendar writes event titles/info in rows (one row per event within a week's row), so if an event takes 2 lines in one cell, then it can cause other events (in other cells) on that row to expand to 2 lines.

Usage tip #1: Since you may need larger cells in order to hold more complete title info for days with multiple events, you can use the small nav calendar on the left to create a multi-week view with fewer weeks than the month view but, therefore, with larger cells--just drag your mouse cursor across the weeks you want displayed in the main calendar. FYI, it's generally "better" to drag up towards Today rather than drag down from Today--whichever day/week you release the cursor on will become the "current" day/week for your views (Day/Week/Month). The following image shows a larger cell achieved by dragging across three weeks in the nav calendar:
http://a.imageshack.us/img23/4727/gcalwrapstrip.png

Updates...
13Jul2010: added the code--commented out for now (might make it the default later)--to keep the nowrap for all-day events when displaying them in the all-day tray in the multi-day and Week views (will still wrap in multi-week and Month views).